: Tracking users between sites using contact forms I have two websites; A and B. I have hyperlinked linked these sites via advertisement banners and have contact forms on both. When people contact

@Odierno851

You can use Google Analytics to do cross-domain tracking:
support.google.com/analytics/answer/1034342?hl=en
The problem with using cookies is they are assigned to a particular domain and
a user's browser may not be setup to store cookies, even if it were possible.

If you have a login system on both, then you might consider establishing SESSION data to store the login across domains. All you have to do then is refer the user to the other site by appending a query string onto the referring link. This way, their data goes along with it. This may look something like this: www.example.com/linkedpage.php?sessid=32189
Another way to do this is if both domains can use the same database, simply store user info on the database that both sites have access to. This could be done through a hidden field on the form or by action when a link is clicked. The problem there is having a script reliably fire off in the face of security on the user's system...so you'll want to do back-end scripting (like PHP, Java, or Python).

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@Welton855

You should use regarding in your contact form or you can use a hidden form named site and give the name in the input value.

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