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i have one domain and 5 subdomains that are currently setup as a WordPress Multisite. I require them to have a single logon and single registration so that a user can register one subdomain and be registered for all of them AND for them to sign in to one of them and be signed into all of them at the same time.
Ideally, I would like the login bar to be at the top of the page above the header - and for it to be common across all sites. Please be aware that on 4 of the 5 subdomains, premiumpress themes are being used.