Cycle through open Windows applications

VBScript in WHS was the way to go.

'****************************************************************************************
' Script Name: ApplicationCycler.vbs
'      Author: Ian Burns
'        Date: 2 Dec 2011
'   Edited By: Makaveli84
'   Edit Date: 30 Aug 2014
' Description: VBScript for Windows Scripting Host. Cycles through any applications 
'              visible in the Task Bar giving them focus for a set period.
'       Usage: Save file to Desktop and double click to run. If it isn't already running,
'              it will start. If it is already running, it will stop.
'*****************************************************************************************
Option Explicit

Dim wshShell
Dim wshSystemEnv
Dim intCycle
Dim intSleep
Dim intTimer

' Cycle every 5 seconds / Check on/off status every 250 milliseconds
intCycle = 5000: intSleep = 250: intTimer = intCycle

Set wshShell = CreateObject("WScript.Shell")
' Volatile environment variables are not saved when user logs off
Set wshSystemEnv = wshShell.Environment("VOLATILE")

' Check to see if the script is already running
If len(wshSystemEnv("AlreadyRunning")) = 0 Then

    ' It isn't, so we set an environment variable as a flag to say the script IS running
    wshSystemEnv("AlreadyRunning") = "True"

    ' Now we go into a loop, cycling through all the apps on the task bar
    Do While len(wshSystemEnv("AlreadyRunning")) > 0
        ' Simulate the Alt+Esc keypress
        If intTimer >= intCycle Then
            wshShell.SendKeys "%+{Esc}"
            intTimer = 0
        End If
        intTimer = intTimer + intSleep
        Wscript.Sleep intSleep
    Loop

Else
    ' Delete the environment variable
    wshSystemEnv.Remove("AlreadyRunning")
End If


' Tidy up
Set wshSystemEnv = Nothing
Set wshShell = Nothing