All VBA projects must be associated with an application; you cannot create a stand-alone VBA project. The application that the VBA project is tied to is called the host application. In the case of iFIX, the host application is the iFIX WorkSpace, and each VBA project is embedded in an iFIX picture file (*.GRF), toolbar file (*.TBX), toolbar category file (*.TBC), schedule file (*.EVS), Dynamo set file (*.FDS), or User file (USER.FXG).