Use external info' feature

Let me explain what is it using pictures:

1. HOW OTHER SCRIPTS DOING:
All sites here running on the other scripts (not Progress TM).
Step 1. A surfer goes from site A to B.
Step 2. The surfer goes from site B to C
Step 3. Script of site C 'doesn't know' that surfer already visited site A and send the surfer to site A again.

2. HOW PROGRESS TM DOING:

 The sites B and C running on Progress TM, site A - other script.
Step 1. The same.
Step 2. Script of site B (Progress TM) send this surfer to site C and inform of all visited by this surfer sites (will be informed that site A visited also).
Step 3. Script of site C 'know' now, that this surfer already visited site A and send this surfer to another site! Looks good? I hope. In result we get more 'external' productivity (surfers don't visit same sites twice) and get more hits back from our trades. Note for Progress TM users: this feature is optionally, but turned on by default. If you decide to turn it off, then go to 'Settings -> Out Settings -> Use external' user info and remove checkbox. Additionally, you are able to turn off this feature for each trade separately in the trade's individual settings.  Visited domains will be delivered using method GET, on the end of URL, like http://www.yourtrade.com/?x=1234.2376.8955.0211 The more sites using this feature, the more benefits from it.