This script automatically emulates keystrokes every x amount of minutes/seconds so that the screen doesn't lock due to a screen saver. I've placed it in a VBS so it can be run from any machine by double clicking or from command line. This one in particular sends a TAB keystroke represented by a tilda (~):
Set objShell = WScript.CreateObject("WScript.Shell")
On error resume next
Do Until Success = True
Success = objShell.AppActivate("Endless")
Wscript.Sleep 500000 'This is milliseconds
objShell.SendKeys "~" 'sends keystrokes
Loop
