How many browsers?

I'm learning about facilitating training in an online classroom and right now I need to test some tools in the Adobe Connect training room.. so I logged in with Internet Explorer as the trainer (host), and since I don't have a second computer available right now, I signed in as a student with Firefox on the same computer. But now I need a third "person" in the room so I installed Opera and signed into the room.

I did this mainly so I can see that I clearly have 3 different "people" (IE, Firefox, Opera) to work with in the same classroom.

I know lots of people use 2 browsers, but do you regularly use 3? 4? more? ...I guess if you are the webmaster, you probably run a few to test your site...

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