How do I  sync a playlist between 2 computers

I have two Macs running the latest Lion and iTunes, and I have the same iTunes Account on both machines. 
On the first machine, I have a play list that I need to get to the second machine.  I do not want to copy all the music over, just the songs that do not exist on the second machine.   I do not want duplicate songs in the library.  And I need the playlist itself moved along with the music.  How can I do this?
Kevin

What do you mean by "Sync".
The general term means when two Libraries (A and B) are compared and files in Library A are copied to Library B, while files in Library B are also copied to Library A so that both Libraries are identical.
This is bi-directional copying and you cannot do this automatically with iPhoto. No Syncing software is capable of parsing the iPhoto Library in this manner. One or both of your Libraries will be damaged if you try this.
You can have uni-directional copying - files in Library A are copied to Library B - this is essentially backing up. Obviously you can also copy from Library B to Library A.
The nearest you can get to syncing is to use iPhoto Library Manager  to move files/Albums/Events plus associated metadata between Libraries. This process cannot be automated.
Putting the Library on an external is easy:
Make sure the drive is formatted Mac OS Extended (Journaled)
1. Quit iPhoto
2. Copy the iPhoto Library from your Pictures Folder to the External Disk.
3. Hold down the option (or alt) key while launching iPhoto. From the resulting menu select 'Choose Library' and navigate to the new location. From that point on this will be the default location of your library.
4. Test the library and when you're sure all is well, trash the one on your internal HD to free up space.
Regards
TD

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