I need `undo' in gnu screen

chen bin <[email protected]>
Newsgroups gmane.comp.gnu.screen.user
Message-ID <CAAE-R+-RXJPDPC8bbx0e5=LkwML3B1y=_74G=ebF1a7-rhMrow@mail.gmail.com>
typical user case,

I use command `only` (C-a Q) to maximize the window to observer some
log,  then I want to restore the previous layout to do other things.
-- 
help me, help you.
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