I have been working on replacing a single working site that is now D6x to D7x site.
The 7x drupal site = mydomain.com/capsule
Mysql > database = mydomain_data03 & user = mydomain_user3
The 6x drupal site = mydomain.com/capsules
Mysql > database = mydomain_data & user = mydomain_user
Mysql prefix for each site database = mydomain_
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These two sites are located on the same server in the core folder mydomain.com and the respective versions are:
http://mydomain.com/capsule = D7x
http://mydomain.com/capsules = D6x
The D6x site has been up now for several years and is the current working site.
The D7x site is up and working correctly for several weeks, and is accessed by removing the trailing "s" from the domain pointer of capsules. capsule"s"
The D7x site is a complete replacement for the D6x site, but all links and domain pointers are presently targeted to the D6x site -> http://mydomain.com/capsules