The SAP Spool system

SAP does not print directly to your local printer. Instead, it has a Spool system — a queue managed by the SAP application server. When you print something in SAP, it creates a spool request (a formatted output document) and sends it to an output device (a defined printer in SAP). The output device then sends the job to the physical printer.

This design means:

• You can reprint past documents without re-running the transaction
• Printing works even when you're not at your desk
• Administrators can manage all print queues centrally

Output devices

An output device in SAP is an SAP-side printer definition, configured via SPAD by your system administrator. Every output device has a name (e.g., LP01, LOCAL), a device type (e.g., PostScript, PDF), and a host destination (the actual network printer or file path).

The device LP01 is the classic default. Some systems also offer PDF1 or similar for generating PDFs instead of paper output.