starting a second illustrator instance

Hi,

is there any possiblity to start a second illustrator instance/process; perhaps by command line parameter?

If I open illustrator with "illustrator.exe c:\temp\test.ai" and illustrator already runs, the existing process is always used.

In a specific use case test.ai should be opend in a new process if illustrator runs or not.

Thanks for any hints

Markus