Loading Screen
There are a few different techniques that can be used to help insure that a user knows when the form might be performing a task. If you have any long running services or JavaScript if you do not let the user know what is going on then they may start clicking around or get impatient and close the browser thinking the application has stopped working.
1. Use a loading screen
2. Change the mouse cursor to a loading cursor. This requires that the javascript security has been set to false in the builder_Config.properties.