gboolean afgs_reg_unregister AfDalNulFunc  usr_function,
gpointer  user_data

The opposite function to afgs_reg_register.

Allows to launch a unregister request for the current Af-Arch serer.

usr_function Function to be executed when response arrives.
user_data User defined data to by passed in to usr_function.
TRUE if unregister process was ok or FALSE if something fails.