[support] Sites communication

Mon Sep 17 21:21:20 UTC 2012

I have several Drupal sites, each one with a different purpose but all 
of them made for the same organization. But I have a problem since the 
same user must authenticate himself in every site..., and that is very 
unconfortable.  Is there any module that allows a user puts his/her 
credentials in a site and then enter to another site using the same 
credentials?..., in other words, is it possible put all the sites 
together with the same authenticaton system (eg. local, LDAP, etc.)? 
Hope you can help me..., thanks...
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