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Does a split window have an ID?

Configure -> Preferences -> Keyboard,
Category Window, Command WindowPaneNext and WindowPanePrev

in my Textpad, these are mapped to F6 and Shift-F6
(with Configure -> Preferences -> Editor -> Keystroke compatibility = Windows Applications).

(I dont know what you would do with the ID if there was one ...)

MudGuard, much thanks. I didn't notice these commands, so I turned to Autohotkey to write a keyboard macro. AHK identifies the windows by an ID