In order to use this linkcode you need to have Contextual traffic. Contextual traffic can be defined as two types of traffic in the context we are using it - One is a legal adware type application that sends traffic whether through a general target, url target, or some other type of target. When the user goes to a page it either pops under the entire landing page via the contextual linkcode or via the browsing interface. The other type of contextual traffic we allow is for Webmasters or On-site placement publishers to place a full popunder of the landing page via the contextual link on their General traffic. This is NOT to be used for Google/Overture type Contextual Search traffic - Our normal banner or text link-urls can be used for that.
I don't understand, please explain.

Thanks,
jun