Vista - 2 different browsers

I am assisting my boss in getting his new pc set up. Needless to say Im an avid user of pc's but vista leaves me frustrated more times than not. I have a lot to teach my boss so far so simplifying things for him is simplifying things for me.

I'd like to set up his pc so that he may use Mozilla Firefox as his default browser. I feel it's a bit safer than a few others and since he's still learning we all know the devestation that random clicking can cause when browsing. Ive been adding icons to his desktop for his email and other things he uses often.

My major issue is that he does need to use internet explorer for ONE application. Is there a way to designate a specific browser for a shortcut... so that he's only using Explorer when he uses that specific app?


Any Ideas?
Please please please, HELP!