[plt-scheme] multiple DrScheme process

Hi All,

At least on Windows box, there can be no more than one DrScheme process. 
Even if I tried to open several .ss files, or execute DrScheme.exe 
several times, they are all runing under the same OS process. I assume 
it saves memory, but I have friends who want to run several .ss program 
in DrScheme simultaneously on a multi-core computer. (I know I can 
compile and run them indecently, but people also want to run source 
within DrScheme.) How could that be done?

-
Chongkai