17. A non-transitory computer readable medium having computer readable program codes embodied therein for performing interactive television program guide operations, the non-transitory computer readable medium program codes performing functions comprising: allowing an operator to update a functionality characteristic of an interactive television program guide implemented on a user television equipment; allowing the operator to remotely supply a markup language document to the interactive television program guide implemented on the user television equipment; updating the functionality characteristic of the interactive television program guide based on the markup language document using the interactive television program guide; and generating a program guide display screen on the user television equipment having the functionality characteristic of the interactive television program guide as updated based on the markup language document.
17. A non-transitory computer readable medium having computer readable program codes embodied therein for performing interactive television program guide operations, the non-transitory computer readable medium program codes performing functions comprising: allowing an operator to update a functionality characteristic of an interactive television program guide implemented on a user television equipment; allowing the operator to remotely supply a markup language document to the interactive television program guide implemented on the user television equipment; updating the functionality characteristic of the interactive television program guide based on the markup language document using the interactive television program guide; and generating a program guide display screen on the user television equipment having the functionality characteristic of the interactive television program guide as updated based on the markup language document. 23. The non-transitory computer readable medium of claim 17 , wherein the updated functionality characteristic causes, in response to user input, the program guide to display a program listings information screen, start a recording, set a favorite channel, or set a reminder.