Palm m100 Handbook page 136

6. Click OK.
The HotSync Manager is now communicating with the simulated port
defined for infrared communication. This means that you cannot use
your HotSync cable again until you reconfigure the HotSync Manager
to communicate with the port defined for cable synchronization.
To configure HotSync Manager for infrared communication
on a Macintosh:
1. Double-click the HotSync Manager icon in the Palm folder.
2. In the HotSync Controls tab, select Enabled.
3. Click the Serial Port Settings tab.
4. Under Check for handheld connection using, select Local Setup.
5. Under Local Setup, select Infrared Port from the Port pop-up
menu.
6. Close the HotSync Software Setup window.
Chapter 5 Page 130