using screen

[William O'Higgins Witteman]

I am a generally happy Gnu screen user, but I have run into a problem.
I am not old-school enough to know what the man page is talking about
when they say this:

C-a C-s     (xoff)        Send a control-s to the current window.

I just know that it puts my screen instance into a state that I cannot
return it from.  Can someone tell me how to get my screen instance to
talk to me again?

Similarly, if I mis-click and hit C-a z, how do I get my session back?
Thanks.
-- 

yours,

William

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