Hello My Fellow Pied Piping PodCatchers,

If you want the freedom to sync your iPhone or iPod with two or more iTunes computers, read on: 

SUMMARY:
In order for your iPhone or iPod to sync with more than one copy of iTunes, without first being erased, each copy of iTunes must have the exact same iTunes Library Identification Number.

Therefore, all that is required is to (1) obtain the iTunes Library ID of one (primary) copy of iTunes and then (2) copy that ID number to a (secondary) copy of iTunes.  Thus, your iPhone or iPod, seeing the same Library ID, will think it is connected to the same copy of iTunes.  

NOTE 1:
The following instructions are for those using Microsoft Windows based computers.  Mac users, Click Here for step-by-step instructions

NOTE 2:
Not that I would ever do such a thing, myself, but I have it on good authority that the following steps work with iTunes 8.2 for Windows.

NOTE 3:
Please read all of the following instructions in their entirety before proceeding.

NOTE 4:
I strongly recommend that you make a backup copy of any files discussed in this document before making any modifications to them. 

NOTE 5:
Files modified must be saved in their original document file format.

NOTE 6:
In order to successfully complete this procedure, you will need a Hex editor.  Click Here to Download a free copy of Hex Edit.  (This program requires no installation.  Once downloaded, just Click on the Filename to launch.) 

OBTAIN THE PRIMARY ITUNES LIBRARY ID (On Computer 1)
1.
From within Notepad or your preferred text editor, browse to:
“My Documents/My Music/iTunes”.

2.
Open the file named, “iTunes Music Library.xml”.

3.
Write down (copy) the value of the Library Persistent ID key (hereafter referred to as ID1) which will look something like:  “20F830293962CBA4” (without quote marks).

4.
Close the file without saving any changes.

MODIFY THE SECONDARY ITUNES LIBRARY ID TO MATCH THE PRIMARY ITUNES LIBRARY ID (On Computer 2)
1.
From within Notepad or any text editor, browse to:
“My Documents/My Music/iTunes”.

2.
Open the file named, “iTunes Music Library.xml”.

3.
Write down (copy) the value of this Library Persistent ID key (hereafter referred to as ID2).

4.
Replace ID 2 with ID 1.

5.
Save your changes and close the file.

6.
Exit Notepad or your preferred text editor.

7.
From within Hex Edit or your preferred hex editor, browse to:
“My Documents/My Music/iTunes”.

8.
Open the file named, “iTunes Library.itl”.

9.
From within Hex Edit, using the Find Menu, with a search type of HEX, search for ID 2.

10.
Replace ID 2 with ID 1.

11.
Save your changes and close the file.

12.
Exit the hex editor.

That’s all there is to it.

Now, simply launch iTunes on your second computer, attach your iPhone or iPod, and enjoy.

Mark