SOLIDWORKS PDM users often experience popups upon executing a command such as opening a SOLIDWORKS file. In this case, by default, SOLIDWORKS PDM launches a popup that wants to know if you are opening a file with the intent to modify or make changes to it, or if you are simply opening it to view the file. The prompt shown below asks the user if they would like to check the file out. At this point, the user has a choice and is encouraged to decide if the intent is to make changes to the file, and thus you would want to check the file out.