If the given window name does not exist, this function returns 1. If window exist, then this function returns 0. Difference between guiexist and waitguinotexist is, waitguinotexist waits for maximum 30 seconds. Still the window does not disappear, then 0 is returned. We can set the environment variable 'GUI_TIMEOUT' to change the default waiting time.
returns 1 on success and 0 on no existing window
This function will be useful, when some event is fired and after that if an existing window should close, we can use this function to wait till the window closes.