91 lines
3.8 KiB
HTML
91 lines
3.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Distributed 5250 Emulation Model</title>
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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<a name="Top_Of_Page"></a>
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<h2>Distributed 5250 Emulation Model</h2>
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<p>The Virtual Terminal Client/Server Model example shows a model for a
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distributed systems environment between a work station and an
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iSeries. The client program resides on the work station, while the server
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program resides on the iSeries<SUP>(TM)</SUP>. This model is similar to the way the iSeries
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supports an iSeries Access work station function.</p>
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<p><strong><a name="FIGDESC">Virtual Terminal Client/Server Model
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Example</a></strong></p>
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<p align="center"><img src="RBAFX603.gif" alt="Virtual Terminal Client/Server Model Example"></p>
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<p>The client program running on the work station shown in the example
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does the following:</p>
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<ul>
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<li>Accepts data from the server program and displays the data on the work station
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display</li>
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<li>Accepts data from the work station keyboard</li>
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<li>Converts the data from the format required by the work station display and keyboard
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to the format required by the server program (5250 data stream)</li>
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<li>Sends the data to the server program on the iSeries</li>
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</ul>
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<p>The link between the client program and server program uses DOS and i5/OS<SUP>(TM)</SUP>
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communications support. This may be LU 6.2, TCP/IP, or some other
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communications protocol.</p>
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<p>You can write a server application program in any iSeries-supported
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high-level language (HLL), such as the ILE C programming language. The server
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program provides work station support for the system acting as the server. The
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virtual terminal APIs allow a server program to read and write virtual terminal
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data. Virtual terminal data is always in a 5250 data stream format. See the
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<cite>IBM 5494 Functions Reference</cite> book, SC30-3533, for more information
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on 5250 data streams. This book can be viewed online through the <a href=
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"http://www.elink.ibmlink.ibm.com/public/applications/publications/cgibin/pbi.cgi?CTY=US" target="_blank">IBM
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Publications Center</a><img src="www.gif" alt="Link outside Information Center">.</p>
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<p>The virtual terminal APIs provide an interface between the server program
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and the virtual terminal supported by the i5/OS licensed program. The virtual
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terminal represents the i5/OS link between the server program and the iSeries
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application and is managed entirely by the i5/OS licensed program.</p>
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<p>The iSeries application is a licensed program or a user-written application
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that performs a standard data transfer to a work station. This application can
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be written in any iSeries-supported HLL.</p>
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<br>
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<hr>
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<table align="center" cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center">
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<a href="#Top_Of_Page">Top</a> |
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<a href="vt1a.htm">Virtual Terminal APIs</a> |
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<a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</body>
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</html>
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