Registers an application name with the current AutoCAD drawing in preparation for using extended object data
for the rules AutoLISP uses to determine if a symbol name is valid.A string naming the application. The name must be a valid symbol table name. See the description of
nil; otherwise it returns the name of the application.If an application of the same name has already been registered, this function returns
If registered successfully, the application name is entered into the APPID symbol table. This table maintains a list of the applications that are using extended data in the drawing.