Unlike modern "Field Programmable" radios that allow you to change frequencies via front-panel buttons, the GM350 is a computer-programmable radio. The programming software (often abbreviated as RSS or CPS) is the Windows-based application that allows a PC to communicate with the radio’s internal memory chip.
The GM350 primarily uses rather than the newer Customer Programming Software (CPS) used for digital MOTOTRBO models. Motorola Gm350 Programming Software