StayAlive Pro is a program that simulates Internet activity so you don't get disconnected from your ISP.

StayAlive Pro Features
Simulating Internet activity through HTTP or PING
Access sites from the list random or sequential
Period between activities can be random or fixed
Nag window removing (when ISP informs you that you are inactive too long)
Automatically start/stop activity when online/offline (DialUp)
Automatically start activity when program starts, Skin support
Automatically start the program with Windows, Disconnect at specific time
Always on top, HTTP proxy support, Stop simulating activity at specific time.