What type of application program allows you to manually enter HTML commands into a blank document?

The correct choice is a text editor or HTML writer, as these applications provide a simple interface for users to manually enter HTML commands into a blank document. Text editors are specifically designed for coding and plaintext editing, making them well-suited for web development tasks such as writing HTML, CSS, or JavaScript. They allow for flexibility and control over the code, enabling developers to focus on the structure and semantics of their web pages.

In contrast, a code editor typically includes additional features such as syntax highlighting and code completion, which can enhance the coding experience but still function within the realm of what text editors can do. A web builder usually offers a graphical interface where users can create websites without directly manipulating HTML code, thus not catering to the manual coding process. An Integrated Development Environment (IDE) offers advanced features such as debugging tools and project management, making it more complex than a simple application for entering HTML commands directly.