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As an alternative, you can create a Windows Service. This runs in the background when the machine starts. The easiest way to create a Windows Service is using Microsoft .NET.
You could even do a VB program that make the calls at intervals. I could write that program in under an hour, spit-shined and polished.
Since most of the mobile providers supports SMTP emails, set up email rule at Outlook (receives email from alert@myalertsite.com) and forward mail to your mobile i.e. 5551212@yourmobilprovider.com.
Draw back your Outlook has to be connected all the time.
It allows you schedule ASP scripts online.