Command Summary
[Left-mouseclick]
[Ctrl-U]
[Insert]
[Delete]
[F2]
[Esc]
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Selects a user.
Adds a new user.
If there is no selection, or a user is selected, a new user will be added.
If a user is currently selected, then this selected user will be deleted.
Allows the name of a selected user to be changed.
When editing a user name, restores the original name. If the user has just been
added, deletes the item.