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You can use the wp_create_user function to create users without a defined email To log in without a password you can see this question


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You can do it with AJAX - for each .tab-content, send via AJAX the ID (for example #tab-content-3). Now on the server receive the id and have a table of ids and add 1 each time. Here you can find and update increment command - make sure to use something like this and not reading from DB and then updating, because this is not atomic and other users can "...


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