On Friday 09 April 2010, SW elucidated thus:
> Reusing authentication seemed to have helped.  Surprisingly,
> documentation doesn't state this.

From: http://code.google.com/apis/adwords/v2009/docs/headers.html

"An authentication token is valid for about a week after you acquire it; 
when it expires, use ClientLogin to retrieve a new one."

Which implies you can cache it and reuse it.

j

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Have you migrated to v200909 yet?
The v13 sunset is on April 22, 2010.

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