passing info to other programs

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I've looked through the docs and I can see how to call other programs, but how
do I pass information to them, such as the port number (serial device number).
if I can use /bin/login @ 
where the "@" passes the userid. Can I pass other information?
--
Scott Knight, Network Analyst - SSM Health Care, Information Center
email: scott_knight@ssmhc.com + phone: 314.644.7344 + fax: 314.647.1037
"Dad, when you come home with only shattered pieces of your dreams, your
little one can mend them like new with two magic words - 'Hi Dad!'"
- Alan Beck in "Fathers and Sons" -