Question on Lenovo R&R CD.

[SaberX]

Just found this cd in a laptop bag from my last thinkpad I bought.
It's a Lenovo Rescue and Recovery CD.
Disk 1 of 1.
Feb 2008
Cd p/n:43R4481
EN

A google search says it may be a downgrade cd for XP Pro for the T61.

I want to know just what the cd is and can it be used on other thinkpads?