[OSM-newbies] Run two versions of JOSM?

[Randy]

This question seemed more appropriate here than josm.devel.

I'd like to be able to choose to run one of two different versions of 
JOSM, the tested version and the latest version. However, they usually use 
incompatible plug-in versions, and they both point to the same default 
application directory (C:[username]\Application Data\JOSM).

Is there a way to change the (Windows) Application Data directory for one 
version or the other of JOSM,without recompiling JOSM, so that I can load 
the appropriate commaptible sets of plug-ins? I didn't find that directory 
in Setting Preferences.

-- 
Randy