what mode?: double-quote yields nothing until next keystroke; how to turn off?

[Daniel B.]

Somehow I keep accidentally getting Emacs into a mode 
in which a double-quote keystroke yields nothing until

I press another key, at which time Emacs inserts the 
two characters I meant (or one character composed from

them).

What mode is this?  (Where is its documentation?  I
haven't had any luck googling and otherwise looking
for it.)

How do I control that mode?  

Mainly, how do I turn it back off (or disable it
entirely)?

Also, how did I probably activate it?


(emacs-version reports:
"GNU Emacs 22.1.1 (i386-mingw-nt5.1.2600) of
2007-06-02 on RELEASE")

Thanks,
Daniel


      
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