=> R1 = pointer to buffer for resulting string
R2 = size of buffer
<= R0 = pointer to buffer (R1 on entry)
R1 = pointer to terminator
R2 = free bytes in buffer
This SWI reads the name of your current printer server, or returns a null string if your printer server is only stored as a number.
Note: NetPrint prior to 5.26 is buggy, returning R1 one too great, and R2 one too small.
See PRM 2, page 391.
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