Hi, if you mean internet browsers:
I tend to use firefox however whenever i build a page/site i test it in i.e. netscape, myi.e.2. and opera. Yes you can install multiple web browsers but quite obviously you can only have one by default. I hope this answers your question. Also quite clearly you should test you websites on different res monitors e.t.c. i have friends who have higher res monitors than me mine.
sorry if this is not an answer to the question your asking and i have got it all wrong again! 
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