Instead of using a communication area (COMMAREA), a more modern method of passing data to the next program in a pseudoconversation is to use a channel. Channels have several advantages over COMMAREAs--see Benefits of channels. To pass a channel on a RETURN command, you use the CHANNEL option in place of the COMMAREA option.
Channels are described in Enhanced inter-program data transfer: channels as modern-day COMMAREAs.