Website to run automatically script on a periodic basis

[kirilyz]

Hello, I have an ASP site with an MS SQL database. The site is hosted not on my own computer but by a hosting company. I need to make a script in asp that will run every day or every six hours and send email reminders of upcoming appointments. How can my script automatically run without me or anyone else visitting a page for the script to run?

I will appreciate any help you can give me. Thanks.