Audience members can use a number of commands in the text chat; these are instructions typed into the text chat input field after a /
/asize 8 (or another number): this changes the font size of audience-input text to 8 (the default size is 5) on that computer. This is useful for people with visual impairment or if the screen is being projected for a group audience.
/psize 8 (or another number): this changes the font size of player-input text, as above.
/info: gives some information about UpStage.
Players have a lot more commands available to them - see the chapter on Commands for more information.