      Software Product  Description   C ___________________________________________________________________   C PRODUCT NAME:  DEC PHIGS Version 3.1 for OpenVMS VAX   SPD 29.38.13    DESCRIPTION   D DEC PHIGS[TM] (Programmers Hierarchical Interactive Graphics System)D for OpenVMS[TM] VAX[TM] Systems is a sophisticated three-dimensionalC graphics support system that defines, modifies, organizes, and dis- D plays hierarchical, graphical data. DEC PHIGS manages this data in a" conceptually centralized database.  C DEC PHIGS for OpenVMS VAX is Digital Equipment Corporation's imple- C mentation of the 1988 ANSI/ISO PHIGS standard for three-dimensional G device-independent graphics. DEC PHIGS supports DECwindows[TM] Motif[R] F for OpenVMS VAX or OpenVMS VAX Workstation Software (VWS), and is sup-C ported on most Digital processors running the OpenVMS VAX Operating  System.   E DEC PHIGS is device-independent; the same program can generate graph- C ical output on different devices without modification to the source B code. The graphical output formats supported by DEC PHIGS include:  # o  CGM (Computer Graphics Metafile)   3 o  DDIF[TM] (Digital's Document Interchange Format)   2 o  Hewlett-Packard[R] Graphics Language (HP-GL[R])   o  PostScript[R]  E DEC PHIGS provides five language bindings in which graphical data can E be created and managed: ISO Fortran, ISO C, Ada, DEC C[TM] (Digital's C version of the C binding), and PHIGS$ (a language-independent bind- E ing). Each of these bindings is packaged as a set of shareable images D with which application programs are linked. The shareable images are% then activated at run-time as needed.   C                               DIGITAL                    April 1995   C                                                         AE-KX14R-TE        F In addition to the features specified in the PHIGS standard, DEC PHIGSF provides PHIGS PLUS features and GM/EDS extensions. These features and extensions include:   - o  Hidden line/hidden surface removal (HLHSR)   & o  Lighting, shading, and depth cueing   o  Additional primitives:   
       Circles        Circular arcs        Triangle strips        Quadrilateral meshes       Indexed polygonsA       Trimmed and untrimmed NURBs (nonuniform rational B-splines)   E The result of this additional functionality is that application soft- C ware need not generate complex graphics, because these graphics are  provided in graphics libraries.   ( Functionality Not Supported by DEC PHIGS  C The functionality from the PHIGS standard that is not currently im-  plemented in DEC PHIGS is:   o  Modeling clip   o  Metafile functions   
 o  Cell array    o  Patterns    o  Incremental spatial search    PEX Support   C DEC PHIGS supports output to Digital's PEX Version 5.0 and PEX Ver- C sion 5.1 servers. For OpenVMS VAX, the PEX server extension and the 8 PEXlib object library are included in the DEC PHIGS kit.  "                                  2        Elements and Structures   G In DEC PHIGS, the smallest component of data is an element. One or more G elements can be grouped together in a structure that describes a graph- E ical object. The elements supported by DEC PHIGS include output prim- ? itives (polylines, polymarkers, and so on), attribute elements, F transformation and clipping elements, control structure elements, and F application data elements. These elements can be edited at any time by an application program.   E Structures are maintained in a graphical database known as the struc- H ture store. Graphical output is generated by a structure traversal mech-F anism that interprets the elements in the structure store and displays< them on the screen. This mechanism is called structure mode.  D DEC PHIGS provides an alternate traversal mechanism called immediateG mode. In this mode, PHIGS elements can be rendered directly to the dis- 9 play surface without being placed in the structure store.    Output Primitives   F DEC PHIGS provides a variety of output primitive elements for creatingF basic two-dimensional and three-dimensional graphics components in the$ structure store. These elements are:  B Annotation -    Text that is transformed from modeling coordinates< Text            to normalized projection coordinates (always>                 readable). This text can be in 8-bit or 16-bitB                 format, and can be displayed in a variety of fonts>                 and orientations. Text position is affected by6                 transformations, but text size is not.  B Fill       -    A filled circular area specified by a center point Circle          and a radius.   B Circular   -    An arc of a circle, specified by a center point, a7 Arc             radius, and starting and ending angles.   B Fill       -    A filled ellipse, specified by a center point, and- Ellipse         major and minor axis vectors.   "                                  3         B Elliptical -    An arc of an ellipse, specified by a center point,> Arc             major and minor axis vectors, and starting and                 ending angles.  = Fill       -    A polygonal area that can be hollow or filled @ Area            with a uniform color or a hatch style. The edges>                 of the area are not defined and cannot be con-?                 trolled. A variant of this primitive allows you A                 to specify the fill area shape, and thus optimize                  performance.  A Fill       -    A set of polygonal areas with holes or disjointed A Area            regions that are treated as a single entity. Con- A Set             trol of edge attributes is provided. A variant of B                 this primitive allows you to specify the fill area9                 set shape, and thus optimize performance.   @ Index      -    A set of polygons (possibly nonplanar) that per-@ Polygons        mits PHIGS to take advantage of shared vertices.  A NURBs      -    A nonuniform rational B-spline, which is a three- A                 dimensional curve or surface generated from user- A                 specified control points, approximation criteria, -                 and possibly trimming curves.   ; Pixmap     -    A pixmap element formatted for X11 display.   ? Polyline   -    A set of connected lines defined by a series of ?                 points and having line type, line width, color, /                 and shading attributes defined.   * Polyline   -    A collection of polylines. Set   = Polymarker -    One or more symbols that can mark significant ?                 points in a display and have type, size, scale, -                 and color attributes defined.   @ Quadrila-  -    An array of quadrilaterals, each of which shares@ teral Mesh      an edge with the next quadrilateral in the mesh.  "                                  4         B Text       -    A character string at a given position in modeling@                 coordinate space. This string can be in 8-bit or@                 16-bit format, and can be displayed in a variety@                 of fonts and orientations. Text size is affected#                 by transformations.   @ Triangle   -    A sequence of triangles, each of which shares an9 Strip           edge with the next triangle in the strip. 
 Attributes  @ Each output primitive element has an associated set of attributeD elements that control the primitive's appearance. Attributes can be > defined in groups (bundles) or individually. Some examples of  attributes are:   ; Line       -    The style of a line, for example, dotted or  Type            dashed.   & Line       -    The width of the line. Width   @ Color      -    The color of the line. You can select one of the@                 predefined colors or specify the red, green, and@                 blue intensities required to define a particular'                 color on color devices.   C Character  -    Text attributes, including font, character spacing, 3 Attributes      height, angle, path, and alignment.    Transformations and Views   C DEC PHIGS allows the definition of objects in their own "modeling"  E coordinate systems. Transformation functions are provided to position B these objects with respect to one another in a "world" coordinate  system.     "                                  5       H World coordinates can have any scale. For example, one application mightF have a maximum range from 0 to 1000.0; another application might limitG the range from 0.01 to 0.1. DEC PHIGS automatically converts from world C coordinates to coordinates appropriate for the display device being  used.   E The user can control multiple, simultaneous views of the same objects D on one or more display surfaces, as well as the position and size ofE the picture on the surface. In addition, DEC PHIGS provides function- F ality for posting structures to specific views, as well as to the dis-. play (as in the standard PHIGS viewing model).   Control Functions   E Control functions are used to perform system management tasks related I to the DEC PHIGS environment, the workstation environment, and the graph- C ics display. These tasks include turning DEC PHIGS on and off when  E requested by the application, and directing the flow of graphics data 8 from the structure store to one or more logical devices.   Inquiry Functions   H DEC PHIGS includes a complete set of inquiry functions. These functions D are used to obtain information about the PHIGS state, the structure B store, the archive storage, workstation capabilities, or the work-D station state. This information is essential for developing modular, device-independent programs.   Escape Functions  F Escape functions are included with DEC PHIGS to enable access to func-C tionality not provided in the PHIGS standard. The DEC PHIGS escape   functions include:   o  Anti-aliasing   o  Batch quick updates   o  Double buffering control   "                                  6        o  Transparency    o  Background pixmap control   o  User-defined line types   o  User-defined marker types   o  Render element range    Logical Input Devices   C DEC PHIGS supports synchronous and asynchronous input from the fol-  lowing logical input devices:   @ Locator   -    Allows the user to select a point on the display.  A Stroke    -    Allows the user to input a series of points on the                 display.   = Valuator  -    Allows the user to select a real number from a B                given range, for example, by sliding a pointer to a(                position on a radio dial.  @ Choice    -    Allows the user to make a selection, for example,0                from a list of choices in a menu.  ? String    -    Allows the user to input a character string, for -                example, as input to a prompt.   B Pick      -    Allows the user to select an object that is visible@                on the display. The information returned consists@                of a structure identifier, a pick identifier, and@                an element number for each level in the structure                network.   	 Name Sets   D Name sets are used by DEC PHIGS to group individual graphic elementsC together when determining eligibility for highlighting, visibility, F and picking. For example, in an architectural drawing, all steam pipesD can be grouped in a name set and all water pipes with another. TheseE sets of pipes can then be made invisible, pickable, or highlighted as  a group.  "                                  7        Archive Storage   C DEC PHIGS provides an interface for archiving files in which all or C part of the structure store can be saved permanently. The structure F store can be accessed later by the same or other applications. Archive files can be used to:   : o  Save and restore graphical information between sessions  A o  Transfer graphical information between compatible versions of      DEC PHIGS  @ o  Transfer graphical information between DEC PHIGS applications  . o  Store accompanying nongraphical information   Character Fonts   F DEC PHIGS includes a series of stroke-precision character fonts. TheseC character fonts were digitized by Dr. Allen V. Hershey of the Naval C Surface Weapons Laboratory, and supplied to Digital by the National  Bureau of Standards.   Language Bindings   D DEC PHIGS functions can be accessed by five sets of subroutine callsD or "bindings," as they are referred to by the PHIGS standards. These
 bindings are:   G o  An ISO C binding that conforms to the final PHIGS ANSI/ISO C binding     standard   H o  A DEC C binding that conforms to a draft version of the PHIGS C bind-G    ing (provided for compatibility with previous versions of DEC PHIGS)   C o  An ISO Fortran binding that conforms to the final PHIGS ANSI/ISO     Fortran binding standard   D o  An Ada binding that conforms to a draft of the PHIGS ANSI/ISO Ada    binding standard   % o  A Digital-specified PHIGS$ binding   "                                  8       F The ISO Fortran, ISO C, and Ada binding interfaces allow users to portE DEC PHIGS applications written in ISO Fortran, ISO C, or Ada to other E operating systems running conformant implementations of DEC PHIGS and E these bindings. Note that calls to the ISO C and DEC C language bind- E ings cannot be mixed with calls to the other language bindings within  the same application.    Graphics Handlers   H DEC PHIGS provides support for a wide variety of Digital and non-DigitalF graphics devices. For devices that are not supported by Digital, usersC can develop their own graphic device handlers using the DEC GKS[TM] ) two-dimensional device handler interface.   @ Device handlers can be developed in DEC Fortran[TM], DEC C, and G DEC Pascal. For more information on this interface, refer to the Build- C ing a Device Handler System for DEC GKS and DEC PHIGS manual (Order 4 No. QA-810AK-GZ), which can be purchased separately.  ' Computer Graphics Metafile (CGM) Output   E DEC PHIGS provides support for storing information using the Computer @ Graphics Metafile (CGM), an approved ANSI standard format (ANSI F X3.122-1986). DEC PHIGS supports CGM output for the following formats:  D o  Clear Text Encoding - Graphical output data stored in this formatF    is easily created, viewed, and modified using a common text editor.A    This format is also suitable for transferring graphical output @    data through networks that support the transfer of text files    only.  D o  Character Encoding - Graphical output data is typically stored inH    this format to reduce the file size. This format is especially suitedF    to transfers through networks that do not support binary transfers.  C o  Binary Encoding - Graphical output data stored in this format is E    very compact and the fastest to read and write. This format is the C    least suitable for transmission over communication lines because *    all 8 bits in each byte are meaningful.  "                                  9        CONFORMANCE TO STANDARDS  < DEC PHIGS is designed to conform to the following standards:  8 o  MIT X Window System[TM] Version 11 Release 5 (X11R5).   o  PEX Version 5.0 and 5.1.   C o  The ISO C binding conforms to the final PHIGS ANSI/ISO C binding     ISO/IEC 9593-4:1991.   D o  The ISO Fortran binding conforms to the final PHIGS ANSI/ISO For-$    tran binding ISO/IEC 9593-1:1989.  F o  The Ada binding conforms to a draft of the PHIGS ANSI/ISO Ada bind-    ing ISO/IEC 9593-3:1990.    HARDWARE  4 The following processors are supported by DEC PHIGS:  1 VAX:        VAXft[TM] Model 110, VAXft Model 310, -             VAXft Model 410, VAXft Model 610,              VAXft Model 612   3             VAX 4000 Model 100, VAX 4000 Model 200, 3             VAX 4000 Model 300, VAX 4000 Model 400, 2             VAX 4000 Model 500, VAX 4000 Model 600  %             VAX 6000 Model 200 Series %             VAX 6000 Model 300 Series %             VAX 6000 Model 400 Series %             VAX 6000 Model 500 Series %             VAX 6000 Model 600 Series   %             VAX 7000 Model 600 Series   3             VAX 8200, VAX 8250, VAX 8300, VAX 8350, 3             VAX 8500, VAX 8530, VAX 8550, VAX 8600,   "                                 10         3             VAX 8650, VAX 8700, VAX 8800, VAX 8810, (             VAX 8820, VAX 8830, VAX 8840               VAX 9000 Model 110,_             VAX 9000 Model 210,_&             VAX 9000 Model 300 Series,%             VAX 9000 Model 400 Seriese  &             VAX 10000 Model 600 Series  ' MicroVAX:   MicroVAX[TM] 3100 Model 80,n#             MicroVAX 3100 Model 90,M)             MicroVAX 3300, MicroVAX 3400,r)             MicroVAX 3500, MicroVAX 3600,t(             MicroVAX 3800, MicroVAX 3900  ( VAXstation: VAXstation[TM] 4000 VLC[TM],%             VAXstation 4000 Model 60,c$             VAXstation 4000 Model 90  / VAXserver:  VAXserver[TM] 3100, VAXserver 3300,e+             VAXserver 3400, VAXserver 3500,d+             VAXserver 3600, VAXserver 3602,t*             VAXserver 3800, VAXserver 3900  %             VAXserver 4000 Model 200,X%             VAXserver 4000 Model 300,-$             VAXserver 4000 Model 500  %             VAXserver 6000 Model 210, %             VAXserver 6000 Model 220,e%             VAXserver 6000 Model 310,l%             VAXserver 6000 Model 320,d%             VAXserver 6000 Model 410,p          "                                 11 d       %             VAXserver 6000 Model 420, %             VAXserver 6000 Model 510,g%             VAXserver 6000 Model 520,p%             VAXserver 6000 Model 610,p%             VAXserver 6000 Model 620,e$             VAXserver 6000 Model 630  < One of the following terminals is required to use DEC PHIGS:  5 o  VT240[TM] with black and white monitor (ReGIS[TM])g  ' o  VT241[TM] with color monitor (ReGIS)i  ) o  VT330[TM] with black and white monitore   o  VT340[TM] with color monitor   2 o  TEKTRONIX[R] 4014 with enhanced graphics module    (Option 34) or equivalent   o  TEKTRONIX 4107 terminal   o  TEKTRONIX 4207 terminal   o  TEKTRONIX 4129 terminal   Disk Space Requirements   C The disk space requirements for DEC PHIGS depend on the kit you in-t stall, as shown.   DEC PHIGS Development Kit:  * Disk space required for      70,000 blocks
 installation:o* With Ada binding option:     90,000 blocks  * Disk space required for      65,000 blocks use (permanent):* With Ada binding option:     85,000 blocks  "                                 12 r      DEC PHIGS Run-Time-Only Kit:  * Disk space required for      40,000 blocks
 installation:n  * Disk space required for      36,000 blocks use (permanent):  E These counts refer to the disk space required on the system disk. ThehD sizes are approximate; actual sizes may vary depending on the user's8 system environment, configuration, and software options.  0 Memory Requirements for DECwindows Motif Support  C The minimum supported memory for DEC PHIGS running in a standalone iG DECwindows Motif environment, with both the client and server executing F on the same system, is 32 MB. The memory size suggested for most typi-D cal hardware configurations, however, is 64 MB or more, depending on the system.   C The system configuration and performance requirements of DECwindows D Motif applications can determine the memory needed on your system as follows:  D o  Less memory may be required on the client system (where the soft-D    ware is installed and executed) if the server (component display-2    ing the application) resides on another system.  E o  More memory may be required on a system where improved performance 9    is desired, or where several applications are running.l   OPTIONAL HARDWAREt  F DEC PHIGS for OpenVMS VAX supports the following input device with the  DECwindows Motif device handler:  ?    Graphics Peripheral Set (32 Function Key Box and 8 Dial Box)   E DEC PHIGS also supports a variety of hardcopy output devices, and de-iG vices that are compatible with these devices. These output devices are:c  "                                 13 m  .   Compatible Sixel Devices  & o  Digital LN03 PLUS[TM] Laser Printer  % o  LN03[TM] with LN03S-UA upgrade kitn  A o  Digital DEClaser[TM] 2100, 2150, 2200, 2250, 2300, 2400 Laser      Printersu  . o  LA50[TM] (restricted to a 2:1 aspect ratio)   o  LA75[TM]o   o  LA84[TM]i   o  LA86[TM]    o  LA100[TM]   o  LA280[TM]  " o  LA324[TM] (Color Sixel Printer)   o  LA380[TM]  ! o  Digital LN03S-JA Laser Printern  5 Compatible Hewlett-Packard Graphics Language Devices:d    o  Digital LVP16[TM] Pen Plotter  ( o  HP[R]7475 Hewlett-Packard Pen Plotter  % o  HP7550 Hewlett-Packard Pen Plottert  % o  HP7580 Hewlett-Packard Pen Plottera  % o  HP7585 Hewlett-Packard Pen Plotter   ' o  LASERGRAPHICS MPS-2000 Film Recorder   / Compatible Hewlett-Packard PCL Level 4 Devices:t  ! o  Hewlett-Packard LaserJet[R] II    Ink Jet Plotters:a  . o  Digital LCG01 Color Ink Jet Plotter (ReGIS)  "                                 14    c   o  Digital LJ250 (Color Sixel)   Compatible PostScript Devices:   o  Apple[R] LaserWriter[R]   o  Apple LaserWriter Pluse   o  Digital LN03R ScriptPrinter   o  Digital DEClaser 2150, 2250   o  Digital DEClaser 1150   o  Digital LPS20 Laser Printer  ! o  Digital LPS20-GJ Laser Printerp   o  Digital LPS32 Laser Printer   o  Digital LPS40 Laser Printer  ! o  Digital LPS40-AJ Laser Printer   ! o  Digital LPS40-DJ Laser Printer-   CLUSTER ENVIRONMENTa  E DEC PHIGS is fully supported when installed on any valid and licensedcH VAXcluster[TM] V5.x configurations including CI[TM], Ethernet, and MixedF Interconnect configurations, and are fully described in the VAXcluster, Software Product Description (SPD 29.78.xx).   SOFTWARE REQUIREMENTS   D The software requirements for DEC PHIGS Version 3.1 are described in the following sections.       "                                 15    i  1 For Systems Using Terminals (Without DECwindows):i  0 o  OpenVMS VAX Operating System V5.5-2 or higher  C o  DEC C Version 4.0 (must be installed when using OpenVMS VAX Ver-hF    sion 5.5-2; however, no DEC C license is required to run DEC PHIGS)   For Workstations Running VWS:   0 o  OpenVMS VAX Operating System V5.5-2 or higher  ( o  OpenVMS VAX Workstation Software V4.5  6 For Workstations Running OpenVMS VAX DECwindows Motif:  C o  OpenVMS VAX Operating System V5.5-2 or higher (and the necessaryf(    components of OpenVMS VAX DECwindows)  $ o  OpenVMS VAX DECwindows Motif V1.2  D For the development of application programs that use DEC PHIGS underG OpenVMS VAX, one of the DEC PHIGS supported languages is also required.    OpenVMS VAX Tailoringh  G The following OpenVMS VAX classes are required for full DEC PHIGS func-s
 tionality:    o  OpenVMS VAX required save set   o  Network support   o  Programming support  C If you are using DEC PHIGS on a workstation, Digital recommends then* OpenVMS VAX class for workstation support.        "                                 16    n   OPTIONAL SOFTWAREa  F DEC PHIGS for OpenVMS VAX supports the following languages through the) DEC PHIGS language independent interface:    o  DEC Ada[TM] Version 3.0A-10   o  VAX BASIC[TM] Version 3.7   o  DEC C Version 4.0   o  DEC Fortran[TM] Version 6.3   o  DEC Pascal Version 5.1    o  VAX PL/I Version 3.5A  E Note: Certain versions of these products depend on a specific versioniF of the operating system. Please refer to the Software Product Descrip-C tion (SPD) of the product in question to determine which version ist
 necessary.   GROWTH CONSIDERATIONSn  E The minimum hardware and software requirements for future versions ofsC this product may be different from the requirements for the currentr version.   DISTRIBUTION MEDIA  ' This product is distributed as follows:   $ o  On 9-track 1600 BPI Magnetic Tape   o  On TK50[TM] Streaming Taper  @ o  As part of the OpenVMS VAX Software Product Library on CD-ROM      "                                 17    h  D This CD-ROM contains the DEC PHIGS software binaries and online doc-B umentation in Bookreader[TM] and PostScript format. The DEC PHIGS C documentation is also available in hard copy, which can be ordered r separately.    ORDERING INFORMATION   Development Option  ( Software Licenses DEC PHIGS: QL-0KBA*-**, Software Layered Product CD-ROM: QA-0KBA*-**- Software Documentation DEC PHIGS: QA-0KBAA-GZt0 Software Product Services DEC PHIGS: QT-0KBA*-**   Run-Time-Only Option  ( Software Licenses DEC PHIGS: QL-VK1A*-**, Software Layered Product CD-ROM: QA-VK1A*-**0 Software Product Services DEC PHIGS: QT-VK1A*-**  C *  Denotes variant fields. For additional information on available xF    licenses, services, and media, refer to the appropriate price book.   SOFTWARE LICENSING  G DEC PHIGS is available in two forms: as a Development Kit and as a Run-o= Time-Only Kit. These kits are furnished only under a license.v  C The Development Kit license enables you to develop and run your own F graphics applications. The Run-Time-Only Kit license allows you to runE applications that were developed on a system where the full DEC PHIGSpE product has been installed under a Concurrent Use License option (ex-wD plained below). As a result, the Run-Time-Only Kit license is avail-F able at a substantially lower cost per system than the Development Kit license.          "                                 18 k  t  # License Management Facility Supporti  E DEC PHIGS supports the OpenVMS VAX License Management Facility (LMF). ? This facility allocates license units for DEC PHIGS as follows:m  B o  For the Development option-on a Personal Use and Unlimited Use     basis  E o  For the Run-Time-Only option-on a Concurrent Use and Unlimited User    basis  E Each Personal Use License allows one identified individual to use DECiG PHIGS. Each Concurrent Use License allows only one individual at a timenE to use DEC PHIGS. Each Unlimited Use License allows any number of in-r, dividuals to use DEC PHIGS at the same time.  D For further details on the License Management Facility, refer to theH OpenVMS VAX Operating System Software Product Description (SPD 25.01.xx)E or the OpenVMS VAX Operating System documentation. To obtain more in-oD formation about Digital's licensing terms and policies, contact your local Digital office.c   SOFTWARE PRODUCT SERVICESe  E A variety of service options are available from Digital. For more in-i- formation, contact your local Digital office.o   SOFTWARE WARRANTY   G Warranty for this software product is provided by Digital with the pur-wE chase of a DEC PHIGS license, as defined in the Software Warranty Ad-h dendum of this SPD.i  H The information in this document is valid at the time of release. PleaseF contact your local Digital office for the most up-to-date information.  > [R]   Apple and LaserWriter are registered trademarks of Apple       Computer, Inc.    "                                 19 o  x    = [R]   Hewlett-Packard, HP, HP-GL, and LaserJet are registered ,       trademarks of Hewlett-Packard Company.  B [R]   Motif is a registered trademark of Open Software Foundation,
       Inc.  A [R]   PostScript is registered trademark of Adobe Systems, Incor-        porated.  < [R]   TEKTRONIX is a registered trademark of Tektronix, Inc.  B [TM]  X Window System is a trademark of Massachusetts Institute of       Technology.c  = [TM]  Bookreader, CI, DDIF, DEC, DEC Ada, DEC Fortran, DEC C,d>       DEC GKS, DEC PHIGS, DEClaser, DECwindows, Digital, LA50,G       LA75, LA84, LA86, LA100, LA280, LA324, LA380, LN03 ScriptPrinter,r=       LVP16, MicroVAX, OpenVMS, ReGIS, TK50, VAX, VAX BASIC, gD       VAXcluster, VAXft, VAXserver, VAXstation, VAXstation 4000 VLC,A       VT240, VT241, VT330, VT340, and the DIGITAL logo are trade-r-       marks of Digital Equipment Corporation.   9 1995 Digital Equipment Corporation. All Rights Reserved.                                 "                                 20