"waitForPopUp" Command
Remember one thing that selenium IDE software automation testing tool can handle only one window at a time. When you are taking some action like clicking on link or button and open new popup window then how to handle it in selenium IDE software automation tool? "selectWindow" command will help you to select window but before that you need to verify that your expected window is open or not. "waitForPopUp" command will help you to wait until your expected window is not open.
You can give JavaScript window "name" of the window in to target of "waitForPopUp" command. If you leave target blank or "null" then "waitForPopUp" will wait for the first non-top window to appear. Put