Runs the command (.cmd) or database output (.vdo) file named. Vensim uses the file name to determine which type of file it is. This would normally be used from within a Venapp, or from within a command file or via the DLL for a .vdo file. It is also possible to nest command files in this way which can be useful if you have a number of commands that are repeated as would be the case for making a number of variations on a simulation in batch mode.