Hi, when I am using VT 6.5 ,there comes a problem.I need to check whether an active windows exists or not frequently, so I write a loop script, during processing, the window will exists for a long time, and every few seconds I have to check whether it is still active or not.The scripts works fine within a small time interval(e.g,5,6mins),however for a longer time(30mins or more)it cannot detect the active window anymore, though the window is actually there and active.I donot know why, can anybody tell me why if have the experience?