WORKABOUT PRO Hand-Held Computer With Windows Mobile 5.0 User Manual 89
Chapter 5: Connecting To A LAN With 802.11
Network Authentication Settings
5.5.2 Network Authentication Settings
Contact your network administrator for the appropriate authentication information.
Tap on the dropdown menu next to Authentication to display your options.

Authentication

802.11 supports four subtypes of network authentication services: Open, Shared,
WPA, and WPA-PSK. Under Open authentication, any wireless station can request
authentication. The station that needs to authenticate with another wireless station
sends an authentication management frame that contains the identity of the sending
station. The receiving station then sends back a frame that indicates whether it
recognizes the identity of the sending station.