Connect 3 wordpress sites user database to one

I have dedicated the last four years to website deign and development, I have extensive knowledge with a variety of applications and web languages including Adobe applications as well as in-depth expertise in CSS3, HTML5, XHTML. I can build websites to run cross platform on multiple different browsers e.g chrome, firefox, IE, ETC I also have four years’ experience in multiple programming languages such as, PHP, MySQL, Ajax, Jquery, Symfony and wordpress. My expertise lay in web design and development, a creative edge enable me to design Profession top class; Logo’s, Banner’s, Website’s, Ecommerce Website’s, Real estate website’s, and Travel website’s and much much more.

Hi. I can do this for you. One question: those site are on same server or different server ? Chat please. Thank you!

Hi there I can do it ASAP. Please share details. Lets Start................. Thanks...................................................................................................

I can do it. Just start chat with me. It will be ready in 1/2 days MAXIMUM(!) But first of all, I need see your sites and get your file & db dumps. Thank you! Best regards, Ivan Nikolayenko.

Hi, You require multi sites in wordpress and that will not be done in just 30 USD. So Could you increase you budget? I can do this with multi sites. Please add me on skype to discuss further about this project it friendzsoft. Thanks,

Hiii, I have very good experience with wordpress. I can do your task as per your requirement with perfection and with in the given time by me. So, for further discussion you may chat , i am available right now. I hope we will discuss soon on it. I am waiting for your positive response. Thanks Hunter Wordpress

Hello, Hope you are doing well. I read your project description, Lets have a technical discussion then we understand, negotiate costing, timeline and then we proceed further. Also I shall show my past work when we discuss. Thanks!

Hi! Hope you're doing great. I have a question about the hosting location for your websites. Is your all three websites and database on the same hosting server or hosting on different servers? I have done this type of project recently.

I think we can solve part of your problem using triggers. I would like to know if the three databases are on the same server? And I would need you elaborate on the logged in feature.