Greetings Eugene:
Yes, it is possible to have both. In fact, if you are programming for the WWW, it is imperative that you check your code in as many browsers as possible since there are so many in use although IExx, in one build or another, presently owns 75 - 80% of the browser market.
For example, I have IE6.2, IE5.5, NN4.7, NN6.2, Mozilla 0.9.5 (which is the parent code for NN6.2[AOL]), Amaya, and Opera all running on my machine.
Each browser version has its own unique directory (folder) on the root of a partition so the OS knows where to point to the proper code for the browser(s)in use. I often have three browsers opened at once with little trouble.
The only thing that you might have to get used to are nag dialogue boxes requesting if you want to make the browser that you are opening the default. If you are operating Windows (win32), IE always takes precedence because it is loaded by default with the OS, but you can change the defaults. I seldom click yes to the default nag, nor permanently close the nag dialogue boxes, from any browser because I don't want associations in my OS only pointing to a particular build, that is unless I am testing associations.
I hope that this may help to answer your question.
CSC
