File sharing doesn't work between two computers

I have a Macbook Air bought late 2009 (I'll call it MBA 1). OS 10.6.0.
I have a new Macbook Air bought a few days ago (I'll call it MBA 2). OS 10.6.4.
I have been attempting to share files from the two computers.
I was able to move files from MBA 1 to MBA 2 without too much fuss. I could do it both ways: by finding "Shared" in Finder and then accessing the files or I could go to "Go" and "Connect to Server". I was able to add the username of the MBA 2 to the list of users in the Sharing pane of the MBA 1.
So going from MBA 1 ---> MBA 2 is fine.
However going from MBA 2 ----> MBA 1 doesn't work.
1) The finder in the MBA 1 doesn't show "Shared".
2) I can't add user to the Sharing pane of the MBA 2.
The problem could be that the two usernames of the MBA 1 and the MBA 2 are very similar.
Username of MBA 1: jk
Username of MBA 2: J K
I tested this theory out by adding a username I just made up called "Jack" and it added the username fine to the list of users.
But it's too late to change the username of the computers now.
What can I do?

I got it to work.
What I did was on MBA 2, I went to "Go" and "Connect to server". Then I selected the MBA 1 to connect to.
As soon as I did that, "Shared" appeared in Finder with the MBA 2's name on it.
After connecting which took a long time, the folders to be shared showed up in the Finder window.
I don't know why trying to connect to MBA 2's server didn't work in MBA 1. I went to "Go" and "Connect to server" many times on the MBA 1 but it didn't work.

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