This no-frills program lets you adjust the transparency of open windows, but don't expect anything awe-inspiring. Crystal XP's comprehensive interface is reminiscent of Windows and offers its configurations in English and Dutch. The program lets you set the transparency of active and inactive windows along with that of your taskbar. Hot keys can be assigned to adjust window transparencies without opening the program's interface. It sits in your system tray at start-up, and you can determine whether it will show your machine's CPU usage or the Crystal XP logo, or if it will be hidden. It displays all open applications and you can add, import, or export programs this utility's settings shouldn't be applied to. Though it could use some additional features or enhancements, this free application does perform its minimal functions properly.