24.3. TUI Single Key Mode
The TUI provides a SingleKey mode in which it installs a particular
key binding in the readline keymaps to connect single keys to
some gdb commands.
exit the SingleKey mode.
Other keys temporarily switch to the gdb command prompt.
The key that was pressed is inserted in the editing buffer so that
it is possible to type most gdb commands without interaction
with the TUI SingleKey mode. Once the command is entered the TUI
SingleKey mode is restored. The only way to permanently leave
this mode is by hitting [q] or [C-x] [s].