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Its function is to help Air Traffic Control (ATC) identify the aircraft and ensure that it doesn't get lost on radar screens. ATC facilities typically assign codes. Each code has its own meaning and is used to distinguish different types of aviation activity.<br><br>The number of codes available is limited. However they are categorized into different groups based on their intended usage. A mode C transponder, for instance, can only use primary and secondary codes (2000 7500, 7000, 2000). There are also non discrete codes that are used in emergencies. These are used when the ATC can't determine the pilot's call sign or the location of the aircraft.<br><br>Transponders use radio frequency communication to send an identification code unique to each individual and other information to radars. There are three modes of RF communication that are available: mode A, mode C, and mode S. Based on the mode, the transponder sends different types of data to radars including identification codes as well as the position of the aircraft and pressure altitude.<br><br>Mode C transponders can also transmit the call number of the pilot. These are usually used for IFR flights or flights at higher altitudes. The ident button on these transponders is typically called the "squawk" button. When an individual presses the squawk button, ATC radar picks it up and shows it on the screen.<br><br>It's important to change the code of a transponder mode C correctly. If the wrong code was entered it would trigger bells at ATC centers. F16s would then scramble to find the aircraft. This is why it's recommended to change the code when the aircraft is in standby mode.<br><br>Certain vehicles require special key programming tools to reprogram the transponder in a new key. These tools communicate with the computer in the vehicle to enter programming mode and clone the transponder in use. 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