Toggles insert/overwrite mode.
Toggles insert/overwrite mode. EmEditor usually starts with the insert mode. When EmEditor is in insert mode, the cursor is shaped as an "I", and inserting a character will not delete any existing characters. When EmEditor is in the overwrite mode, the cursor becomes a solid rectangle, and inserting a character will delete the existing characters and will overwrite with new characters. This command will toggle the insert mode and the overwrite mode.
document.selection.OverwriteMode = !document.selection.OverwriteMode;
document.selection.OverwriteMode = NOT document.selection.OverwriteMode