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
DX = segment of shadow buffer
04h get shadow buffer info
Return:
BH = rows in shadow buffer
BL = columns in shadow buffer
DX = segment of shadow buffer
05h stop shadowing

Return:
AL = FFh if DESQview not installed

Notes: 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.

BUG: Subfunction 05h does not appear to work correctly in DESQview 2.52

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