Default browser for web querys?
 

Is it possible to change a web query to work from a different
browser... ive got a sheet im making for a friend and they have 2
browsers open at the same time and two of them work from the same
computer one person through IE the other Opera. they both want a copy
of my spreedsheet to work for a site they are looking at, but the site
is a sign in site... (querys work fine on it) but they found using 2
different browsers they ould both be signed in without conflict. so is
there away for one persons spreedsheet to update via Opera the other
via IE so that they dont get each others info...?