INT 15h,  80h (128)      Device Open                                     many

Provides an interface to open a device with a specific process.

On entry:      AH         80h
BX         Device ID
CX         Process ID

Returns:       Carry      Set if service not supported, else cleared

Notes:         The PC, PCjr, and the XT dated 11/08/82 do not
support this service.

                                                                          

This interface is supported for multi-tasking
environments, where more than one process (or task)
may be executing in the system. Usually the
operating system will supply the handler for this
service; this way, the operating system can keep
track of which processes are using each device on
the system.

The operating system will use this service to
initiate the use of a device by a process.

See also: INT 15h, 81h
See also: INT 15h, 82h

INT 15h, 80h (128) Device Open many