Looking for a program that will simply visit a webpage every 6 minutes. Preferably without opening a new tab (I tried using Task Scheduler, but it would open a new tab every time)
WebChangeMonitor will do exactly what you want.
You can set the interval at which the page will be checked, and it can even display the differences in the HTML. It is fast, efficient, and works very well.
You can configure it to check almost any number of pages (upper limit unknown).
Furthermore, you can set the User Agent being used for the HTTP/HTTPS requests.
It is gratis and open-source. The source code and executables are available here: