Good question; I was wondering the same if http://www.abc.com/ and http://www.abc.com the same?
When I use the tool site explorer it displays results from http://www.abc.com/ but results are generated for http://www.abc.com as well..
Kinldy let me know how to solve this issue?
A simple redirect of http://www.abc.com to http://abc.com/ will solve the issue?
"http://www.abc.com is just an example"