win/stay_awake.ps1

   1 $wsh = New-Object -ComObject WScript.Shell
   2 $minutes = 15
   3 do{
   4     $minutes-=1;
   5   # Send Shift+F15
   6   $wsh.SendKeys('+{F15}')
   7   Start-Sleep -seconds 59
   8 }until($minutes < 0)
   9 # Thank you to http://www.zhornsoftware.co.uk/caffeine/