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+<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
+
+<html>
+
+<head>
+<meta http-equiv="Content-Type"
+content="text-html; charset=Windows-1252">
+<title>INT 2F,0 - DOS Multiplex Interrupt - Get Installed State</title>
+<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
+</head>
+
+<body>
+
+<h1><a name="kap_interrupt_3050"></a>INT 2F,0 - DOS Multiplex
+Interrupt - Get Installed State</h1>
+
+<p> AL = 00</p>
+
+<p> AH = 00 DOS 2.x PRINT.COM (undocumented, see note below)</p>
+
+<p> 01 PRINT (undocumented behavior also, see note below)</p>
+
+<p> 05 Critical error handler (undocumented DOS 3.0+)</p>
+
+<p> 06 ASSIGN (see note)</p>
+
+<p> 08 DRIVER.SYS (undocumented DOS 3.2+)</p>
+
+<p> 10 SHARE</p>
+
+<p> 11 Redirector/IFS is resident</p>
+
+<p> 12 MultiDOS is resident</p>
+
+<p> 13 Swap 13h and 19h</p>
+
+<p> 14 NLSFUNC</p>
+
+<p> 15 GRAPHICS.COM (see note below)</p>
+
+<p> MS CD-ROM extension (MSCDEX) (see note below)</p>
+
+<p> 16 Windows 386</p>
+
+<p> 17 DOS shell</p>
+
+<p> 19 SHELLB.COM (DOS 4.0 only)</p>
+
+<p> 1A ANSI.SYS (DOS 4.0+)</p>
+
+<p> 1B XMA2EMS.SYS</p>
+
+<p> 40 OS/2 compatibility box</p>
+
+<p> 43 Himem XMS driver</p>
+
+<p> 7A Novell Netware IPX</p>
+
+<p> AD DISPLAY.SYS internal (DOS 3.3+)</p>
+
+<p> AE DOS installable command extension (DOS 3.3+)</p>
+
+<p> B0 GRAFTABL.COM (DOS 3.3+)</p>
+
+<p> B4 IBM 3270 emulation</p>
+
+<p> B7 APPEND (DOS 3.3+)</p>
+
+<p> B8 LAN existence</p>
+
+<p> B9 LAN RECEIVER.COM</p>
+
+<p> BF LAN REDIRIFS.EXE</p>
+
+<p> C0-FF reserved for user applications</p>
+
+<p> on return:</p>
+
+<p> AL = 00 not installed, ok to install</p>
+
+<p> = 01 not installed, do NOT install</p>
+
+<p> = FF installed</p>
+
+<p> - the installed test for append returns non-zero if
+installed;</p>
+
+<p> zero if not installed</p>
+
+<p> - AH = 00 and 01 are used by DOS 2.x PRINT.COM and is not a
+check</p>
+
+<p> for installed state, see BIBLIO reference to
+&quot;Undocumented DOS&quot;</p>
+
+<p> - ASSIGN returns non-zero if installed</p>
+
+<p> - installation checks with AH=15 do not follow the standard
+format;</p>
+
+<p> - see ~Bibliography~ reference to &quot;Undocumented
+DOS&quot;</p>
+
+<hr>
+
+<table border="0" width="100%" cols="3">
+    <tr>
+        <td width="33%">Zur<EFBFBD>ck zum <a href="inte1at0.htm">Interrupt
+        Info</a>. </td>
+        <td align="center" width="33%"><a
+        href="mailto:Roger.Morgan@htl-steyr.ac.at">Roger Morgan</a>
+        / 1998 </td>
+        <td align="right" width="33%"><font size="1">L.<2E>nderung <!--webbot
+        bot="Timestamp" s-type="EDITED" s-format="%d.%m.%y"
+        startspan -->29.03.99<!--webbot bot="Timestamp" endspan
+        i-checksum="13964" --> </font></td>
+    </tr>
+</table>
+</body>
+</html>