How can i close all apps that are running with autoit?

$DELAY = 200
Send("!{F4}")
Send("!{F4}")
Sleep($DELAY)
Send("!{F4}")
Send("!{F4}")
Sleep($DELAY)
Send("{ESc}")

Run("taskmgr.exe")
WinWait("Windows Task Manager","","SysListView321")
ControlSend("Windows Task Manager","","SysListView321","+{DOWN 15}")
sleep(200)
ControlSend("Windows Task Manager","","SysListView321","!e")
Sleep(100)
ControlSend("Windows Task Manager","","SysListView321","!f")
Sleep(100)
ControlSend("Windows Task Manager","","SysListView321","x")