The term "c00lgui" seems to be a colloquialism or a codename for a specific GUI tool or framework. Without more context, it's challenging to provide a precise definition. However, based on common practices, it's likely that c00lgui is a custom-built or open-source GUI solution designed to simplify interactions with a system, application, or hardware.

Keep in mind that without more specific information about the c00lgui FE script, this piece is a general introduction to the concept. If you have more context or details, I'd be happy to try and provide more targeted information.

The c00lgui FE script might be written in various scripting languages, such as Python, Bash, PowerShell, or JavaScript, depending on the specific requirements and the system it's interacting with.