frames and no frames content

I would like to canvass opinions on the requirement and use of noframes content. I have searched the archives but couldn't find any specific details.
 
If a section of a site (e.g an form, calculator etc) requires the use of frames due to the way it has been built, I understand the available markup to make the frameset meet W3C guidelines and that noframes content should included. 
 
My question is: where frames are unavoidable due to technologies used, infrastructure etc, is it acceptable that the noframes content is merely an explanation that frames is required. Checking the W3C guidelines it merely states to use noframes content but doesnt indicate if this must be a version of the same content/functionality that doesnt rely on frames.
 
I appreciate that content/functionality should not rely on frames and it is easy to say "redevelop it so it doesnt use frames", but where there are other business factors that prevent this currently happenening, what should appear in the noframes content?
 
Also as a side query, does anyone have any stats on browsers used that do not understand frames.
 
Thanks
 
 


		
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