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Int 15 Fn 80 C - OS Hook - Device Open (at,xt286,ps) [B]
AH = 80h
BX = device ID
CX = process ID
CF clear
Return: CF clear if successful
AH = 00h
CF set on error
AH = status
80h invalid command (PC,PCjr)
86h function not supported (XT)
Note: this function should be hooked by a multitasker which wishes to keep
track of device ownership; the default BIOS handler merely returns
successfully
See Also: AH=81h,AH=82h
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