                          INVISIBLE LAN UPDATE
                              VERSION 4.00

                Copyright 1996 Invisible Software, Inc.



       [See GUIDE.TXT for a list of all manuals and text files.]



     This file describes new features added since the last printing of
the Invisible LAN instruction manual.



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TABLE OF CONTENTS:

 1.  Technical Support for Invisible LAN
 2.  Using CD-ROM with Invisible LAN
    2.1.  Installing MSCDEX
    2.2.  Accessing CD-ROMs
    2.3.  Technical Information
 3.  Invisible RAM
 4.  Windows For Workgroups



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1.  TECHNICAL SUPPORT FOR INVISIBLE LAN


     Technical support for Invisible LAN is available on the Invisible
Software web site, at the following address:

        http://www.invisiblesoft.com

     You can contact us by email at the following address:

        invisoft@invisiblesoft.com



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2.  USING CD-ROM WITH INVISIBLE LAN


     Invisible LAN supports the use of CD-ROMs on the network.

     There is really nothing special you have to do to access CD-ROMs.
A CD-ROM is "just another disk".  If the file server has a CD-ROM, you
can establish a mapping to the CD-ROM and access its files in exactly
the same way as you would access the server's hard disk.




2.1.  INSTALLING MSCDEX


     MSCDEX is a program that allows DOS to access CD-ROMs.  You should
have received a copy of MSCDEX when you bought your CD-ROM drive.

     MSCDEX should always be installed before you start the network
software.  For example, a typical start-up sequence might be:

                MSCDEX
                NET30


     You only install MSCDEX on computers where the CD-ROM drives are
physically located.  Do not install MSCDEX on network workstations that
only access CD-ROMs through the network.

     EXAMPLE:  Suppose you have four computers:  A, B, C, and D.
Computer A is a server with two CD-ROM drives.  Computer B is a
workstation which also has its own CD-ROM drive.  Computers C and D are
workstations which do not have their own CD-ROM drives.

     In this example, you would install MSCDEX on computers A and B,
since these computers have their own CD-ROM drives.  You would not
install MSCDEX on computers C and D, since these computers do not have
CD-ROM drives physically attached to them.

     In this example, computer B can access the two CD-ROMs on computer
A, as well as accessing its own CD-ROM.  Computers C and D can also
access the two CD-ROMs on computer A.  Computers C and D cannot access
the CD-ROM on computer B, since computer B is not configured as a file
server.




2.2.  ACCESSING CD-ROMS


     With MSCDEX properly installed, you can access a server's CD-ROM in
exactly the same way as you would access a server's hard disk.
Specifically, you can use the MAP command, the MENU program, or the
Windows Network Manager to establish a drive mapping to the server's
CD-ROM.  Once the drive mapping is established, you can read the files
on the CD-ROM just as if it were attached to your own computer.

     For example, suppose that MIKE is a file server, and suppose that
MIKE's drive D: is a CD-ROM.  You can establish a drive mapping with
the following command:

                MAP  F:  \\MIKE\D:

     Now, you can use drive letter F: to read any of the files on
MIKE's CD-ROM.  For example, the command "DIR F:" would display a list
of the CD-ROM's disk directory.




2.3.  TECHNICAL INFORMATION


     The following information is for programmers or advanced users
working with CD-ROM on the network.

     All CD-ROM files are automatically marked as "shareable" files.
This means that any file on a CD-ROM can be accessed by any number of
users simultaneously.  There is no way for one user to prevent other
users from accessing the file.

     There is no record locking for files on CD-ROM.  This means that it
is not possible for one user to lock out other users.

     When you establish a drive mapping to a CD-ROM, the network
redirector automatically simulates the behavior of MSCDEX.  Therefore,
you can run programs that depend on MSCDEX, even though MSCDEX is not
installed in the workstation.  The redirector provides the following
MSCDEX functions:

        Function 1500 - Get Number of CD-ROM Drive Letters
        Function 1501 - Get CD-ROM Drive Device List
        Function 150B - CD-ROM Drive Check
        Function 150C - Get MSCDEX Version
        Function 150D - Get CD-ROM Drive Letters

     If the workstation has a local CD-ROM drive, the network redirector
cooperates with the local MSCDEX.  Function calls that pertain to
network CD-ROMs are handled by the redirector, while function calls that
pertain to local CD-ROMs are handled by the local MSCDEX.



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3.  INVISIBLE RAM


     Previous versions of Invisible LAN included memory management
software called Invisible RAM.  We are no longer including Invisible
RAM, because most users don't need it.  Most users use the memory
management features of DOS or Windows, instead of using Invisible RAM.

     If you want Invisible RAM, you can obtain it free of charge by
downloading it from our web site (http://www.invisiblesoft.com).



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4.  WINDOWS FOR WORKGROUPS


     Invisible LAN includes a program called QSETUPW that completely
automates the installation of Invisible LAN for Windows 3.1.

     There is no comparable program for installing Invisible LAN with
Windows For Workgroups.  You need to follow certain special procedures
when installing Invisible LAN with Windows For Workgroups.  Refer to
WORKGRP.TXT for a complete description of the required procedures.
