Compatibility: 3.0+
Expects: AX    0106H
                                                                  
Returns: AX    0000H and CF=NC=0 if the queue is currently empty
or error code (if CF=CY)
DS:SI the address of the DevHdrRec of the device driver that is
currently in use by Print.Exe for print spooling.
                                                                  
Info: This provides a way to ascertain the name and other attributes of
the device that is in use for print spooling.

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INT 2fH 0106H: Get Printer Device Driver Header