Keys are special in jumpmod, as their original function cannot be used in multiplayer. Instead 8/9 of the keys were converted to be used as checkpoints. You can read more about checkpoints on the jump specific entity page.

In vanilla quake, key entities are commonly used to lock doors or gate an event behind the player obtaining one with a trigger_key. Each of them act in the exact same way.

Entity Description
key_airstrike_target Key/checkpoint
key_blue_key Key/checkpoint
key_commander_head Key only
key_data_cd Key/checkpoint
key_data_spinner Key/checkpoint
key_pass Key/checkpoint
key_power_cube Key/checkpoint
key_pyramid Key/checkpoint
key_red_key Key/checkpoint

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