Dell Latitude CP Service Manual page 54

memory module sockets (2)
retaining clips (2 per socket)
The memory module should rotate upward out of its retaining clips.
Memory modules can be installed only one way. Do not attempt to force the
memory module into the socket. Align the notch near the center of the mem-
ory module with the corresponding key in the memory module socket.
Removing and Replacing Parts 4-17