What you want to specify in this section depends on your AD structure
Code:
("LDAP://cn=users,dc=MyDomain,dc=com")
Looking at your AD tree, it works from the inner-most OU out in your AD structure, left to right in your LDAP query.
For example, you want to target SubSubOU1 in the following example located here.
Code:
MyDomain.com
OU1
OU2
OU3
SubOU1
SubOU2
SubSubOu1
OU4
The code for this would be
Code:
("LDAP://cn=SubSubOU1,cn=SubOU2,cn=OU3,dc=MyDomain,dc=com")
Does that make sense a bit?