start_chat_jid and spark session running

Hi all!

I am trying to use command line to initiate a chat session with a specific user.  The problem I have is that my computer is usually running another instance of Spark, and if I run

spark.exe "start_chat_jid=satur@begar.es"

or

C:\Program Files\Spark>spark.exe "username=jjalonso&password=********&server=wf.begar.es&start_chat_jid=*****@begar.es"

spark is not started. The command only works if no instance of spark is running....

Any help would be very appreciated.

Best regards,

JJ