Kevin,
A4T is represented by the post_tnt and post_tnt_action variables. The post_tnt column represents all tests currently qualified for. The post_tnt_action represents all tests qualified for on that hit. The patterns of the variables are: TargetCampaignID:TargetRecipeId:TargetType|Event/Action. For Event/Action, 2 = activity impression and 32767 = Activity Conversion.
Keep in mind, this information is subject to change without notice.
Thanks,
Jantzen