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oldlinux-files/docs/interrupts/int-html/rb-2690.htm
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<TITLE>Int 21/AH=2Bh/CX=4445h
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Int 21/AH=2Bh/CX=4445h - DESQview - INSTALLATION CHECK -
AH = 2Bh
CX = 4445h ('DE')
DX = 5351h ('SQ')
AL = subfunction (DV v2.00+)
01h get version
Return: BX = version (BH = major, BL = minor)
Note: early copies of v2.00 return 0002h
02h get shadow buffer info, and start shadowing
Return: BH = rows in shadow buffer
BL = columns in shadow buffer
">
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<h2>Int 21/AH=2Bh/CX=4445h
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<h3><font color=#C00040>DESQview - INSTALLATION CHECK</font></h3>
<PRE>
AH = 2Bh
CX = 4445h ('DE')
DX = 5351h ('SQ')
AL = subfunction (DV v2.00+)
01h get version
<p><b>Return:</b><br>BX = version (BH = major, BL = minor)
</PRE>
<p><b>Note:</b>
Early copies of v2.00 return 0002h
02h get shadow buffer info, and start shadowing
<PRE>
<p><b>Return:</b><br>BH = rows in shadow buffer
BL = columns in shadow buffer
DX = segment of shadow buffer
04h get shadow buffer info
<p><b>Return:</b><br>BH = rows in shadow buffer
BL = columns in shadow buffer
DX = segment of shadow buffer
05h stop shadowing<br>
<p><b>Return:</b><br>AL = FFh if DESQview not installed
</PRE>
<p><b>Notes:</b>
In DESQview v1.x, there were no subfunctions; this call only identified
whether or not DESQview was loaded. DESQview v2.52 performs function
01h for all subfunction requests 0Ch and higher and appears to ignore
all lower-numbered functions not listed here..
DESQview versions 2.50-2.52 are part of DESQview/X v1.0x; version 2.53
is part of DESQview/X v1.10; and version 2.63 is part of DESQview/X
v2.00.
<p><b>BUG:</b>
Subfunction 05h does not appear to work correctly in DESQview 2.52
<p><b>See Also:</b>
<a href="rb-0567.htm" tppabs="http://www.ctyme.com/intr/rb-0567.htm">INT 10/AH=FEh</a> - <a href="rb-0568.htm" tppabs="http://www.ctyme.com/intr/rb-0568.htm">INT 10/AH=FFh</a> - <a href="rb-1214.htm" tppabs="http://www.ctyme.com/intr/rb-1214.htm">INT 15/AX=1024h</a> - <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-1728.h \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-1728.h'" tppabs="http://www.ctyme.com/intr/rb-1728.h"
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DESQview/TopView and Quarterdeck Programs</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
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