Grabbed from the Lik-Sang page:
The process of playing the games looks as follows:
(a) Insert original PS2 game or the Utility Disc.
(b) The PS2 will begin to load and will automatically open the Door.
(c) Now you have 3 seconds to change the Disc, after this it will automatically close the CD-Door again.
(d) It will now play the Game.
In their newsletter they sent via email (I bought stuff there more than a year ago) it says: You don't need the ORIGINAL gameCD to boot, but you still need a PS2-CD to boot (the utility-CD will do)
PS. Why the hell are the messages in a random order and isn't the last meesage on the bottom anymore?