how to specify ip address through variables

Hi all,

First Question:
------------------
How I can specify the ip address of src-ip/dst-ip <cmp> <address-list>
through variable like $External_Net like in snort signatures.

Suppose same ip address is there in many signatures.How can I define it at
one place.

Second Q
-------------
after event is generated,then how can i call either c++ code or python code
from bro scripts.If it is possible ,can you provide me link.
(Some where i read that through bro scripts, we can call python or c++ code)

Third Q
-----------
Currently Zeek is used at which super computing facility.Is it used at
NERSC center. Just  to know that. You can provide me link also.

Thank you so much.

Ravi

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