If this parameter is included in the out link, internal skim will be ignored and external skim will be used instead.
For example: /your_te3_directory/out.php?es=1&l=sponsor1&u=http://www.sponsor.com/
Imagine this scenario. You're using internal skim (set to e.g. 75%) on your site and you want to track clicks on sponsor links through TE (link report), but of course you don't want to skim those clicks. Surfer must be sent to a sponsor link each and every time he clicks on it. Setting external skim (s=100) in the out link is not enough, because internal skim outpowers external skim (read more about skimming here). For this reason you will have to include “es=1” parameter in your out link to force TE to use external skim instead.
I perhaps am not understanding the the difference between where the different skim types are used. Default, internal, external. Internal skims are skims for system traffic, and default is for user trade traffic?
Internal skim is not intended for system trades exclusively, but it does have the highest priority - it outpowers both default skim and external skim.
You can force TE to use external skim instead of internal skim by placing "es=1" parameter in your out link. However, you must also specify, which skim pattern should be used by adding "s=" parameter. So your link should look like this:
.. Curious though as to why the es=1 could not use an es=100 to not skim, rather than to have to add the s=100 ?
It appears with my original link the es=1 meant that on the first click it would skim, then after that it goes to the intended purl.
abbrevation "es" stands for external skimming - if "es=1" parameter is found in the out link, default and internal skim will be ignored and external skim will be used instead. It doesn't matter, if you set es to 1 or to 100 or whatever number or char - "es" can only be "off" or "on".
If you don't add it to the URL at all, it is "off". If you add it to the URL, e.g. es=1 (or es=100, or es=bla, or es=anything), then it is "on". In this case you must also specify, which skim pattern should be used by adding "s=" parameter to the out link.
Hope this answered your question,
best regards, Rock
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