Reproduced here:
1.
f:\wordproc\tse_beta Sun 07-12-25 19:30:41>grep -i0s ToggleColumnReplaceMod *.*
SemWare Grep v2.07 for Win32 [Sep 13 2023]
Copyright 1996-2023 SemWare Corp. All rights reserved worldwide.
File: F:\WORDPROC\tse_beta\ui\ws.ui
f:\wordproc\tse_beta Sun 07-12-25 19:30:45>
===
So not found anywhere except in WordStar ws.ui
file.
And there is only a 1-liner found, not the function definition thus.
//<ctrl k><i> ToggleColumnReplaceMode()
and searching for '<ctrl k><i>' shows:
"<Ctrl k><i> ToggleColumnReplace"
and this 'ToggleColumnReplace' is also only found as that 1-liner.
Conclusion: both are mentioned in the ws.ui as a key-assignment.
But the actual implementation (e.g. proc ...) is not there.
with friendly greetings
Knud van Eeden