I know search engines do not likes frames, but what about IFRAME? How does google see IFRAME? I want to let my affiliates use IFRAME to show my banner. Will google consider the banner url as a backlink or will it totally ignore the IFRAME?
An IFrame is an Inline Frame, as such, google sees it as a seperate page than the actual page displaying the frame. Having your affiliates place your banner in an iframe will help the page displaying your banner get indexed, but I highly doubt they will count as backlinks.
The banner on the IFrame is on a seperate page as Tim says, but since your page is linking to the page shown in the IFrame , G will most likely index it as well, give it PR, etc. and the banner will get a backlink and all the perks, etc.
I agree with Roman. G seems to follow IFRAMEs without a problem. I have numerous IFRAMEs indexed, but no PR yet. Only one link to each one, too.
Why not just give them the code for the image and make it a proper link? Or use a SSI to make it invisible.
Iframe page needs link from elsewhere in your web pages or any spaces. You need to active it as the visible page. That is the great way to let iframe get indexed easily and search engine friendly.