Printing over Bluetooth

I was told that I could buy two Bluetooth USB adaptors, place one in the laptop, and one in the USB port of a printer. (The printer, an HP Photosmart 7850, is Bluetooth capable.)

Once I try to configure a Bluetooth printer port in XP, I never find the Bluetooth USB adaptor connected to the printer.

Was I given bad information or am I doing something wrong?

Thanks in advance for any assistance.

Stephen