SHIFT+F6
The _pwbprevwindow macro moves the focus to the previous window. That is, PWB sets the previously active window as the active window. This action moves among the open windows in the reverse order of Selwindow (F6).
_pwbprevwindow:=cancel meta selwindow <
Cancel
Establishes a uniform “ground state” by canceling any selection or argument.
Meta Selwindow
Moves the focus to the previous window.
<
Restores the function's prompt (if any). By default, function prompts are suppressed while a macro is running.
Cancel, Meta, Selwindow