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Int 21 Fn DF0B - Software Carousel - Set Task Switch Callback [T]
AX = DF0Bh
BH = interrupt number or 00h
BL = function number to invoke on partition switch
CL = function number to call when it is safe for resident programs
to perform DOS calls
DS:DX -> FAR function to call if BH=00h
Return: AL = status
00h Carousel not running
01h successful
FFh unsucessful
AH = error code (01h,03h) (see AX=DF01h)
Notes: the specified interrupt or FAR function is called with AH set to the
appropriate one of the values specified in BL and CL, and BL set to
the new task number
the function specified by CL will not be called until the notification
is enabled with AX=DF0Ch
See Also: AX=DF0Ch
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