Switch trees in NT?

I would like to switch between different trees on NT (Maybe 2 different Oracle versions, maybe a dev2000 tree). If I'm correct this requires changes to the registry. Is there someway to automate this task? I used to write shell scripts in unix to do this, but now what???

TIA
Rick Poepping
rickp_at_crl.com
rpoepping_at_mdc.com

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Rick Poepping                                          Just my Opinions.
St. Louis, MO USA                                      Keep it Simple.
rickp_at_crl.com                                          Friend of Bill W.