UNO derives from the Latin word for one and stands for "as one".

UNO is the root of Unity.

UNO is a theme that brings the sunken unified toolbar/titlebar look&feel to every single window on your system (cocoa or carbon, metal or aqua and already unified windows as well).

On an higher level, UNO's main goal is to enhance aqua interface consistence, by making all elements look&feel "as one".

UNO is aimed to those who want a clean and un-osbstructive interface while keeping the best of Aqua.

The unity level proposed by UNO does not compromises overall GUI contrast: UNO and UNO shade can be mixed up in order to achieve that usability goal.

UNO also fixes some Blue/Graphite appearance inconsistencies.

Install:
UNO includes its own installer/uninstaller.
Running the installer will provide an automatic backup of your current GUI files (but only the first time is ran, so further UNO updates won't overwrite previous backup). The backup can be found in /Library/Application Support/interacto.net/UNO/guifix/ and will be needed in order to "Restore from backup", and is vital for "guifix" functioning.
After install there will be no UNO related process running in the background.
• If using other theme, revert to default Aqua GUI first!
• Quit all applications.
• Run UNO app.
• Chose "Install" (toolbar or menu).
• Select the UNO variation you wish to apply to the various GUI elements.
• Enter your administrator password when prompted.
• Restart your computer to complete installation.


Uninstall:
To Revert to Aqua default GUI files:
• Run UNO app.
• Chose "Restore from Backup" (toolbar or menu).
• Enter your administrator password when prompted.
• Restart your computer to complete uninstall.


Troubleshooting Restoration:
If something goes wrong with the installation, like not being able to get to the UI after reboot, you can Restore your GUI files from backup:
• Press "command + s" during boot to enter single user mode.
• Enter "guifix" (without quotes) at prompt.
• "guifix" will check your disks for errors, fix them if any, restore your GUI files[*] from backup and reboot.
_[*] mozilla apps users will need to manually delete the userChrome.css and toolbar.gif found at ~/Library/Application Support/Firefox/*/chrome/ and at ~/Library/Thunderbird/*/chrome/ . And apps skins must be removed by UNO app.

Minimum requirements:
UNO 1.5 requires:
• PPC or Intel based Macintosh.
• Mac OS X 10.4.4 or later (tested through 10.4.10).