Sometimes it is desired to insert a random number into the markup code, to prevent browsers to cache the creative.
Example:
<img src="http://ad.se.doubleclick.net/ad/www.customer.com/home;ord=INSERT_RANDOM_NUMBER_HERE">
Answer:
Simply insert _U_ where you want the random number to be inserted. It should be rewritten to:
<img src="http://ad.se.doubleclick.net/ad/www.customer.com/home;ord=_U_">
The system will insert the random number on the fly when delivering the creative. The random number is number of seconds since 1970.
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