Optional Arguments
Enter optional numeric or alphanumeric values that are passed into the command or filter handler. Using optional arguments allows a single handler to be easily reused for different tasks.
For example, DF_WEBBR is a demonstration command handler that displays web pages. By specifying DF_WEBBR as the command handler and putting the required URL (e.g.: www.lansa.com) into Argument 1 will cause that web page to be displayed.
The optional arguments have no meaning with mock-up handlers because they have no functionality.
This property is in the Commands Enabled tab.