The Xastir Help Menu includes the following items:
This pops up a static overview page giving information about Xastir, when it was compiled and a few of the options which have been compiled in.
This is the route into the runtime "Help" documentation. Check this for information about configuring Xastir.
EMERGENCY BEACON MODE ENABLE
Use this option only in the event of an emergency. It will cause Xastir to, as the name implies, send out an EMERGENCY! beacon, which will get attention from many hams many miles away!