From Glk to Channel IO
The standard Glulx interpreters use the Glk IO library to manage input and output.
FyreVM was built to replace Glk with Channel IO. Channel IO is a fancy way of saying that all data coming from the story is storied as separate items like "main text", "location name", "turn count", "time", "score", and other types of data. This allows the interpreter to handle data semantically, so main text is shown in some central part of the screen while other types of data are displayed in other ways. No assumption on displaying the story is made within Inform 7. The only display capabilities offered within FyreVM-Web are in-line styles like b, i, em, strong, with an additional special hyperlink capability to identify text that can be clicked to send a command to the story engine.