like refinery said the majority of host applications use
each their own folder in OS9 - and they doesnt even let you choose another one or rename it.
in opposite to MAS, RTAS, TDM, which have a fixed path in the system extensions folder.
a good strategy is to define one of your programs your "main" program and install everything there, so that everything is in the same folder. if you need the plug-in elsewhere, you then make a copy of it for the other app (and not only move it)
i for example had multiple copies of cubase installed back in the days, of which one was dedicated to "all plug-ins installed", one for development, and one for mastering and mixing.
(since i am max user i dont care much about install locations, i use mosty drag and drop or have my stuff beeing automatically preloaded.
)
