INT 2F,4 - Multiplex Interrupt - Pause / return status

AL = 04

AH = 01 resident portion of PRINT

02 resident portion of ASSIGN

10 resident portion of SHARE

B7 resident portion of APPEND

C0-FF reserved for user applications

on return:

DX = error count

DS:SI = pointer to queue of files

- each file in the queue is represented by 64 byte filename

- the file currently being printed is the first entry in the queue

- the last entry in the queue is a null string