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Review by  Erich Oelschlegel Reviewed on 2004-11-22 Suitability: 10/10 Great for the job. Ease-Of-Use: 9/10 A menued interface, simple layout. Overall: 10/10 Feature-rich, a must for all 89ers. Doors OS is a shell with a simple design for the TI-89. Of all the shells available for the 89, this one is the most feature-rich and offers a variety of customization options. Similar to the VAR-LINK menu in the built in OS, Doors OS surpasses it even in functions. It can do all the basic functions of the VAR-LINK menu (create folders, copy, move) with the exception of linking two calculators, and it does them better. It provides icons for common file types and shows the libraries needed to run each file. To save RAM space, there are two options available. It has a built-in (un)archiver as well as a compression program to "zip" your files. It displays free ram in the top corner and program description (if available) in the bottom status bar. Navigating Doors OS is fairly easy with the cursor buttons, and hotkeys are standard. Although learning all of the hotkeys is tedious, all of the menu items are available with the push of two buttons at minimum, and pressing a letter key will bring you to the closest file match starting with that letter. One of the hotkeys is a special password-protected shutdown, where if a person tries to turn it back on, he is surprised with a cool-looking request for the "Doorspass." Failure to enter it correctly (or not enter it at all) results in turning the calculator off. Of all the features in this build, it simply surpasses all other shells. It has a great SDK packaged in the ZIP, and its libraries make repetitive tasks easy and programs smaller.