Historically, these were simple files provided on floppy disks by Motorola to system administrators. These are the keys commonly targeted by third-party "syskey generators."

The key allows the CPS to download specific "permission" data into the radio. If you attempt to use a key for SysID 1111 to program a radio for system 2222 , the radio will typically remain muted because it won't recognize the transmitted ID. Types of Motorola System Keys

These are simple files (often with a .key extension) stored on a computer that allow basic access to program trunking parameters for a specific SysID.