Use placeholder keywords to report on unsupported features
About placeholder keywords
Even if DoubleClick Search (DS) doesn't fully support a specific feature of an engine, you can often still use DS for reporting by creating placeholder keywords.
A placeholder keyword is a keyword that provides DS with the information it needs to track visits. After you create a placeholder keyword, you manually copy the keyword's tracking information to the engine. When your customer clicks an ad or other targeting item in the engine, DS collects data about the visit and redirects the customer to the ad's original URL.
The steps for creating placeholder keywords are different depending on the type of engine account: