HP LaserJet 9000 Printer series - Manual (Page 29)

ENWW Using the stapler 29
• If you are using a PS driver for Windows NT or Windows 2000,
select the appropriate settings for Document Options,
Printer Features, Output Destination, and Stapler. Also, the
stapler option is automatically selected if you select Stacker
Bin (Stapled max 50 sheets) in the Output Destination tab.