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diff --git a/docs/fs.md b/docs/fs.md
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@@ -130,7 +130,11 @@ Existing Plan9port/v9fs clients need a userspace bridge for QUIC.
tag does not move, so the two can differ -- the active column, where
pane/new and a look place a pane next (- when there is none)
/tag the workspace tag; > replaces it, >> appends, one line
-/tagexec write a word: a middle click on it in the workspace tag; read as /exec
+/tagexec write a word: a middle click on it in the workspace tag; read as /exec. A
+ pane's word (Undo, Msg, Save) is refused there and at a column's exec,
+ `not a session control message "Undo": write it to pane/<n>/ctl` (EINVAL),
+ never done at the pane with the keyboard; a tag's own words (New, Tty,
+ Find, Grep in a column's) run
/col/<n>/tag the tag of the column with serial n, the same way
/col/<n>/ctl write Delcol, Joincol, New or Tty: each acts on that column, as from its tag
/col/<n>/exec write a word: a middle click on it in that column's tag; read as /exec; rmdir col/<n> closes