Use to work on two parts of a program, or two programs,
simultaneously.
Split divides the View window horizontally. Use F6 and
Shift+F6 to move between the windows on the screen:
■ F6 moves the cursor down through the windows.
■ Shift+F6 moves the cursor up.
To restore an unsplit View window, choose Split again.
The active window contains the cursor. This window can be
sized from the keyboard:
■ Alt+Plus(+) expands it one line.
■ Alt+Minus(-) shrinks it one line.
■ Ctrl+F10 expands it to fill the screen, or returns
it to its former size.