how to create wordpress network with multiple wordpress installations

Question

i want know it is possible to have 2 or 3 wordpress installations ,get together create ,and create a network .,which will share user data across the network, if there any reference that will be great,

Answer 1

If you have a network, you don't need multiple installs.

I would just start researching networks more via the codex. http://codex.wordpress.org/Create_A_Network