SINGLETON command
Determines whether (or not) multiple copies of BricsCAD can run at the same time.
                Note: This command can be entered transparently during commands
                (‘singleton).
        Options within the command
- Yes
 - Allows only one copy of BricsCAD to run.
 
- No
 - Allows two or more copies of BricsCAD to run.
 
Note: Some third-party applications run only in a single
                    instance of BricsCAD.