PRDiscover is used to discover the IP address of your PigRemote on the local network as described in the PigRemote User Guide.
PigRemote is a small appliance that enables you to remotely control your amateur radio station. Since the device has no user interface, it sends pings to the local network at a periodic interval. This app, PRDiscover, can be used to determine that IP address for use in other iOS apps that are compatible with PigRemote, such as HamLog, PRControl and PRAudio.
More information on PigRemote can be found at http://pignology.net/pigremote