A hyper-text browser and editor are built into MrEd's system. Hyper-text files contain links which can be clicked to move the cursor position to a tag in the same file or in another file. Hyper-text files use the extension ``.htx''.
There are three main frame classes for hyper-text files:
To open a hyper-text document, invoke either mred:open-hyper-view or mred:open-hyper-make. mred:open-hyper-make is installed as the file type handler for files with the ``.htx'' extension. To use the hyper-text classes directly, first call mred:hyper-text-require (with no arguments) to insure that the class definitions are autoloaded.
The frame classes use mred:hyper-canvas% for the canvas and mred:hyper-edit% for the edit buffer. All hyper-text frames belong to the frame group mred:hyper-frame-group. Loading hyper-text files into an edit buffer from a different class (not derived from mred:hyper-edit% ) will produce warnings that the footer information cannot be read and the hyper-text will not work.