How do I use blue tooth on my laptop IBM T41?

It depends upon what you mean by "USE".

0. Do you HAVE bluetooth?
- there is a bluetooth light over the keyboard (of course probably not lit)
- there is a bluetooth identifier on the bottom of the laptop
- the FN+5 key brings up a menu of (possibly, wireless) and Bluetooth.

0.1 if NOT then you need to ADD a bluetooth USB adapter

Usage:
1. Use to synchronize a PIM or cell phone or other DATA connection
- This should be fine; you need to solve (0) first (that you HAVE the hardware) then the driver, then have it running

2. Use a bluetooth headset to listen to audio.
- this you can *NOT* do with the default IBM bluetooth stack - I tried, an "audio adapter" for the bluetooth was simply not supplied by IBM. It would require changing to some non-IBM bluetooth stack, and I chose not to do that so never got a bluetooth headset working with my T41.