I also think it is something like the keyless entry

Even the remote locking can be called as power locks but this term is used for manual "central locking" that is when you lock the driver's side door, all will be locked.

keyless entry is the remote locking system...in which u wont need a key to enter the car... but incase of power door locks.... the drivers door lock is the prime lock...all other locks correspond with this lock... and in this case keyless entry is not possible since it has to be locked/unlocked manually (by the driver).