How can a program know if screen number changes?

Chip Salzenberg <[email protected]>
Newsgroups gmane.comp.gnu.screen.user
Message-ID <CANSL5VHfgScLtaPk5yja1tNrLgg1_kMhSrnJkU55tSySy5YBLg@mail.gmail.com> 
I put my screen number in my prompt (PS1).  I would like to know if the
current screen number has changed from what it was.  How can I learn this?
 Is there a status string I can request, e.g?

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