Win32 dev on two versions of mysql

Hi,

I read the recent thread (Sept) on installing two instances of mysqld
and binding them to two different IP addresses, but unfortunately I have
to develop on two different versions of MySQL and they both need to work
on 127.0.0.1 (localhost)--though not at the same time, of course. 
What's an easy way to accomplish this, so that I can (quickly, if
possible) switch between say, 4.1 and 5.0.23 or whatever and have them
both on localhost?  I realize that I can remove the instance of the
service on each, in turn, using the MySQL Server Instance Config Wizard,
but I'm hoping there's a quicker and easier way to do this than that.

Can anyone help out..? I'm sure this isn't too unusual a situation for
developers on Windows.

Thanks,
Brad

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