[Mono-list] running two different versions on mono on one box?

[ted leslie]

I have a need to keep one particular older version of mono on computer,
because it's included in a system that I have deployed and need to
support, and it not convenient to upgrade those environments at this
time, but yet still update applications written against that older
version of mono.
But,
I'd like to run the newest stable version too on my machine.
Write now i do this by having a script, a pre-script/post-script
that moves the mono binary, libs and /etc/mono to the version 
I want, runs the program, and then changes it back.
There must be an easier way? to selectively run a mono app against 
a particular mono version, and do so with different versions on the
same machine? I am thinking there is a set of environment variables?
I can dig on it, but figuring someone can probably post there sol'n
in 2 seconds.

-tl