| Command group | Flag affected | Reversible | Execute on client | Platform(s) |
| Data files | NO | YES | NO | All |
This command sets the specified data file the "current" data file. If your methods refer to file class names without specifying the data file, it is essential to make the appropriate data file current before setting a main file.
Open data fileArchive.df1,DataFileA
Open data file(Do not close other data)myData.df1,DataFileBSet current data fileDataFileA
Set main filefCustomers# fCustomers.Field1 now refers to DataFileA.fCustomers.Field1