IE6 and IE7 Same PC Same time?

I have need to test courses in both IE6 and 7. Is there a way to have them both running on the same PC at the same time? I have tried several things with no success.I have need to test courses in both IE6 and 7. Is there a way to have them both running on the same PC at the same time? I have tried several things with no success.

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