CF Session cookies (CFID, CFTOKEN, CFAuthorization_<app-name>)

[community_help]

This question was posted in response to the following article: http://help.adobe.com/en_US/ColdFusion/10.0/Developing/WSe61e35da8d3185183e145c0d1353e31f559-7ffc.ht...

[henrylearn2rock]

When shall one set sessioncookie.disableupdate=true and authcookie.disableupdate=true?  Whenever session variables are set ourselves using cfheader or cfcookie? 

Is this a new requirement?  What do they do exactly?

We used to set setClientCookies=false and that's all we need to do before CF10.  Please advice.