I have here a Palm hack that works. I got the instructions from another website and have rewritten them to make them easy to understand. I used a Palm V. I have attached the files that I downloaded from the sites mentioned in step 1 and 2. 1) Go to http://www.pacificneotek.com browse DOWNLOAD and select the remote for MOST USERS. Don't download the v1.171 as this is not registered and certain features don't work. I donwloaded OmnniRemote Pro (which is free) 2) Go to http://dev0_2000.tripod.com and download the Sony_DVD_Hack.pdb 3) Install both files to your Palm Pilot 4) Turn your Sony DAV-S400 on with no disc inside. 5) ON THE EQUIPMENT NOT ON REMOTE - Press and hold both the Display and Stop keys while turning the volume control to the right. When your TV screen flickers, release the buttons. You should be seeing the Service Menu now. 6) Turn on the Palm Pilot and got to REMOTE feature 7) Make sure you select the SONY DVD HACK from the drop down menu in the top right-hand corner. The screen should show a row of buttons (ignore the screen instructions as they are for another SONY DVD Player) 8) I sent numbers 1 to 5 with the PALM and then turned off the DVD PLAYER using my normal remote (you will not see any messages on the screen telling you you have succeeded). 9) I tried playing a region 1 DVD and it WORKED. Hope this helps all you out there.