What feature do most GUI editors provide to facilitate posting web page files to a host?

The feature that most GUI editors provide to facilitate posting web page files to a host is often referred to as the "Publish Feature." This functionality allows users to easily upload their website files directly from the development environment to a web server with minimal effort.

The Publish Feature typically streamlines the process by managing the file transfer automatically, ensuring that all files needed to make the website operational on the server are uploaded correctly. It may also include options for managing how files are grouped, which files to update, and providing assurances that the changes made in the editor reflect on the live website once published.

The other options, while related to website management or upload processes, do not represent the primary mechanism used by GUI editors for publishing. For example, an "Upload Wizard" could be a specific tool but is not a standard feature in all GUI editors. A "Content Management Tool" usually relates to managing and organizing web content rather than the technicalities of file transfer. "File Transfer Protocol" (FTP) is a method used for transferring files over the internet, but in the context of GUI editors, it is wrapped up within the "Publish Feature" that simplifies this process for the user, making it the correct answer.