Screen splitting on screen

In screen the terminal multiplexer.

• To split vertically: ctrl a then |.
• To split horizontally: ctrl a then S (uppercase one).
• To unsplit: ctrl a then Q (uppercase one).
• To switch from one to the other: ctrl a then tab

Note: After splitting, you need to go into the new region and start a new session via ctrl a then c before you can use that area.