How to know if an object is still exist ?

From: Wei Xie (xiewei@clever.weizmann.ac.il)
Date: Mon Mar 29 1999 - 13:02:30 MEST 

Dear Rooter, 

Maybe the question is already exist in ROOT digest but I failed to 
find it:

   How to know if an object is  exist or not ?

One more question is :

    Is there a easy way to lookup ROOT digest if my question has 
    already been answered or not, e.g. to find a my keyword is in the
    contant (not subject) of a e-mail ?  Trying to go through every
    message is really not easy.  

Sincerely yours
Xie

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