Implementing PC Printing in the SAP System 
Local printing as described in
Implementing R/3 Local Printing is not possible with most printers connected to Windows and IBM OS/2 PC’s and Apple Macintosh computers. Only Windows NT, of available Windows systems, can support the R/3 application server with spool work process required for local printing. R/3 application servers also cannot run on IBM OS/2 PCs and Apple Macintosh computers.SAP therefore provides its own remote-printing solution for printing from Windows PCs. This solution uses the R/3 SAPlpd program to transfer output requests from the SAP spool server to the Windows print manager. SAPlpd can run on all systems.

Prerequisites: To implement remote printing on Windows PCs, do the following:
For Access method, select S (Print on LPDHOST using R/3 protocol) or U (Print on LPDHOST using Berkeley protocol).
For an example, see
Example: PC Printing
For more information
: