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SeedRandom and $SessionID

Hi Everyone,

I'm doing some Monte-Carlo simulations on a cluster.  Since by default 
the random number seed is based on the system time, I sometimes get the 
same seed being used in multiple Kernels if they're launched 
simultaneously from a shell script (something to avoid).  Is there any 
danger in using $SessionID as the random number seed?  Also, does anyone 
know the bounds on $SessionID (compared to the bounds on the random 
number seed) are and whether the processID is included in the 
calculation of $SessionID?  Alternatively, has anyone worked out a good 
way to seed the random number generator in Mathematica?

Thank you!
-Kerry Kim

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