access multisite

This question is a bit similar to what has been asked here before but my use case is a bit different.

I have 13 Drupal 7 sites that share the source code. 12 of them run the same modules / settings but look slightly different. At the moment I use 13 databases.

I have about 50 users on each site and each user has some nodes.
Every site has its own taxonomy terms but the vocabularies are mostly named similar.

My goal is to let users from site A login into site B without filling in their profile again.
I have some custom modules running that alter the user profile fields.

Em Drupal7 qual é o melhor módulo multisite e como gerir diversos utilizadores para os diversos multisites.

Obrigado e boa noite

boas,

estou a ter problemas a instalar vários sites no d7,no Wamp Server.

tenho instalado o wamp em "C:\wamp\" e o Drupal 7 em "C:\wamp\www\drupal7\".
no drupal 7 queria ter 2 sites: default e website1.com.
ja tenho as 2 pastas criadas: "C:\wamp\www\drupal7\sites\default" e a "C:\wamp\www\drupal7\sites\website1.com" (com o ficheiro "settings.php" em cada),mas só consigo aceder ao default.

como é que consigo aceder ao website1.com?

Hola a tod@s,

Estamos haciendo dos sitios para una importante editorial de Argentina, para dos de sus revistas. Tenemos pensado hacer un multisite y hacerlo en Drupal 7.

Tenemos la idea de compartir la base de datos de usuarios para ambos sitios, y que los usuarios puedan usar una misma cuenta para ambos sitios, o sitios agregados en el futuro, y ahi es donde surgen las dudas. Estuve investigando pero obviamente todavía no hay mucho documentado para mutlisite en Drupal 7, y menos para compartir el log in. Para drupal 6 hay algo pero no es claro, y tampoco se si se aplica a Drupal 7.

Is it possible to have granular access for multisite installations.

Consider the following setup:

A portal site called, for example - mypets.com

with the following subdomains(multisites) - cats.mypets.com, dogs.mypets.com, turtles.mypets.com

Assuming all users are registered with mypets.com, would it possible for admins to then grant access to subdomains?