>I have inherited support of a website that uses session variable extensively to store user selections, the site is ASP.Net with code in VB.Net
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>The site is being accessed by some clients via an iFrame, which gives me an issue as in some browsers the sessionID is lost between pages when within an iFrame.
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>I have been looking at various options like using querystrings and/or ViewState, but both of which have advantages and disadvantage but this is not my normal area, so would appreciate any advice on which might work best?
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>Alternatively is there anyway to pass a session ID or in some way get the session to persist between pages?

Passing a query string might be an easy approach to use. For something transparent, a cookie might do it.