The menu item File ► Other Macintosh Account is used to work with bookmarks on other Macintosh computers, or on other Macintosh accounts on the same Macintosh. The former case can be a little tricky if you're not already logged in to the other Mac.
After clicking Other Macintosh Account, if you don't see the Volume containing the account you want, click the "More (Network)" button. Then, it depends on your OS...
Mac OS 10.3 (Panther) or 10.4 (Tiger)
In these older systems, click through:
Computer > Network > My Network > Other Mac
You will then see a "Connect..." button which can be used to view and log in to any account as a registered user. It is rather tedious but should be familiar to Tiger users.
Mac OS 10.5 (Leopard)
In Leopard, it's usually much easier. You click on the desired "SHARED" Mac, and then the desired Home folder. It all "just works" if you have previously logged into this other Mac account in Finder and did check "Keep in my Mac OS X Keychain".
But if the password is not in your Keychain, you'll get a message indicating that Bookdog could not get the data. Following the instructions,
• Open a Finder window.
• If it is not showing the left-side toolbar, click in the menu View ► Toolbar.
Then click on the SHARED volume containing the account whose bookmarks you
wish to open.
• Look at who you are "Connected as", and if it is not the account you want, click
"Disconnect" or "Connect As..." and select the folder of the account whose and
doubleclick on the home folder of the bookmarks you want. After doing so, the
subdirectories of the desired home After so doing, the subdirectories (Desktop,
Documents, etc.) should now show in the window. It's a good idea at this point
to look at the items in, say, the Desktop and verify that you've got the correct
account on the correct Mac.
• Enter name and password if asked.
• One more step! At this point, the window may say that you are Connected
as: the account you want, but probably this is untrue. To finish, go to the list in
the body of the window
• Return to Bookdog, start again from menu and File ►Other Macintosh Account
and it should work now.
Caution: Same-Name Accounts on different Partitions and Macs
Keep in mind that, unfortunately, once a home folder is "mounted", it becomes a "Volume", and the Mac OS does not give you any clue about the disk on which it resides. So if you have an account with the same name on two or more Macs, or multiple disk partitions and "mount" more than one of them, you've got to carefully identify which is which.