Hello, I was able to find another posting that seems similar to your question. Try having a look at the discussion posted at <a href="http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RNAME=ViewQuestion&HOID=506500000008000000F1170000&ECategory=LabVIEW.LabVIEW+General";>Capture Keystrokes While VI Running in the Background</a>.
