1) P.C (no MAC's ... sorry)
2) Photoshop 5.5 and above. (may also work with Photoshop 5.0)
~You may need a registered version of Photoshop as WallPampered needs to save the wallpaper which may be disabled in unregistered versions.
3) Microsoft Windows 95 / 98 / ME / NT / 2000 / XP.