Saver Starter is cool freeware which lets you start your computer screen saver according to your mouse cursor positions. So, you can simply instruct your computer to start the current screensaver by placing the mouse cursor to any corner of your screen which you have configured.
When you start Saver Starter a yellow coloured square will appear in your system tray
When it turns red, it means that the Saver Starter has disabled the current screen saver and stopped it from running.
If it turns green then it means that it is about to activate the current screen saver.