






                    Citrix
                    WinView
                    Application Notes


                 Eicon Technology's ACCESS 3270 for Windows




                    This application note is
                    for informational use only
                    and Citrix makes no
                    representations or
                    warranties with respect to
                    the contents or use of
                    this document or of any
                    third-party products
                    discussed within.





March 11, 1994




Citrix Systems
210 University Drive
Suite 700
Coral Springs, FL 33071
(305)755-0559
FAX: (305)341-6880



Overview
--------

     This application note discusses the use of the Eicon Tech
ACCESS 3270 connectivity for Windows product (referred to as A3270)
with the Citrix WinView Application Server (referred to as WinView)
product.  A3270 is a Windows-based 3270-type terminal emulator that
allows access to an 3270 from a Windows workstation.

Using A3270 on a WinView application server rather than on a DOS
station provides all the benefits of application servers to A3270
users: high-speed remote access, enhanced WAN access, and access
for underpowered LAN stations.

     The intended audience for this document is a engineer who has
had hands on experience with WinView.

     The scenarios described in this document have been
tested by Citrix and Citrix believes that you should be able to
get A3270 to work with WinView without any problems if you follow
carefully the information and steps in this document.  Other
variations to the scenarios described in this document may in fact
work fine, however they have not specifically been tested by
Citrix.  In order to maximize your chance for success, you should
use the specified revision levels of all software products
described in this document and stay within the bounds of the
features and functions described in this document.

     Please note that this application note document is a living
document and will be modified as new information and new versions
of the software described herein become available.  Make sure you
have the latest version of this document before you begin.  The
latest version is always available in the Citrix Forum on
CompuServe.


Requirements
------------

     To use A3270 on a WinView application server you will need the
following:

     Software Requirements
          - Citrix WinView 2.2 or 2.21
          - Eicon Tech's ACCESS 3270 Connectivity for Windows 3.14 rev 1

     Hardware Requirements
          - Async connection with Modem

          - WinView server
               > 486DX-25 CPU or larger
               > 12 meg memory or more



Configuration Notes
-------------------

        You should have at least version 3.20 of A3270.  Because A3270
runs in a DOS session under Windows, only COM1 and COM2 are avaliable
for use.  This means that a maximum of two users can be using A3270 to
dial out at a time.



Limitations of Access 3270 under WinView
----------------------------------------

Not all features and functions of A3270 are supported under
WinView.  Limitations under WinView are itemized below:

        1.  Using A3270 to connect to Netware for SAA will not
            work due to a bug in A3270 that will not allow it
            to run in standard mode.

        2.  Any connection type that needs to use NetBIOS will not work
            due to NetBIOS not being supported in WinView.

        3.  Using A3270 to dial out with modems to a 3270 will only
            work on COM1 and COM2.  COM3 and COM4 are not supported
            under WinView.  Multiport adapters can not be used for
            this purpose either, because DOS sessions can not use
            or access these devices.



Installation Notes
------------------

        1.  Set up all users that will be using A3270 for Windows.
            (See WinView manuals)

        2.  Log in as one of the Windows users and start Windows.
            Follow the Access 3270 Installation instructions to
            install A3270.  Make sure that you install for  "Multi
            User" setup and not "Single User".  Uncheck the VxD
            that A3270 tries to install.  The VxD will not work
            in WinView's standard mode Windows.

        3.  At the end of the install, the program will ask for user
            directories.  Type in the users home\WINDOWS directory:

                           D:\USR\JAYL\WINDOWS

            and select the OK button.  This will cause the install
            program to copy all its INI files into that user's
            directory.  When its done you may type in the next
            user's home\WINDOWS directory and press OK.  When
            you have done this for each user that will use A3270,
            Press the DONE button to continue with the installation.

        4.  At the end of the installation, the program will ask you
            for your connection type.  Make all connection types
            inactive execpt for the ASYNC connection.  You may then
            use the SETUP button to setup the COM port parameters
            to be used.  Press OK when done.

        5.  Connect a modem of the type you to your COM1 and/or COM2
            port on your WinView server with a modem cable.



Performance Tuning
------------------

        If you notice that the connection is slow, or goes bad often
you can try the following:

        1.  Try using 16550 UART COM1 and COM2 ports.  These have
            larger buffers and will reduce these problems.

        2.  Set the DOS property "IDLE SENSITIVITY" to 100%.  Only
            do this for the sessions that are running A3270 and
            only do it if you must.  Doing this could possibly
            slow down the rest of the system.


Software Compatibility Notes
----------------------------

        Known incompatibilities are:

        1.  Using A3270 in the Netware for SAA connection mode.
            This causes a GP fault in the application.  This is
            due to a bug in A3270 that will not allow it to run
            in Windows standard mode.

        2.  Using any connection type that requires or tries to
            use NetBIOS.  NetBIOS is not supported with WinView's
            NetWare support.  However, if you are using WinView
            with MS Lanman in a workstaion configuration, this
            may work.


