Depends on what you're trying to do I suppose. I found a page that describes the process somewhat - the second page at that link talks briefly about connecting an app directly to a server for a wireless provider.
If you're just looking to send alerts from a script, look into using an email address for the cell phone provider to send the message. One site I found listed the following for various providers:
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timeasmymeasure
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Date: 2007-09-11 11:48 pm (UTC)http://www.developershome.com/sms/howToSendSMSFromPC.asp
If you're just looking to send alerts from a script, look into using an email address for the cell phone provider to send the message. One site I found listed the following for various providers:
T-Mobile: phonenumber@tmomail.net
Virgin Mobile: phonenumber@vmobl.com
Cingular: phonenumber@cingularme.com
Sprint: phonenumber@messaging.sprintpcs.com
Verizon: phonenumber@vtext.com
Nextel: phonenumber@messaging.nextel.com
Another, more exhaustive, page on sending SMS via email or web is this guide to SMS during emergency situations:
http://home.avvanta.com/~libertyhall/sms.htm
Hope that somewhere in those you find something useful. ;)