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5.19.6 Terminal output

If you are outputting to a terminal, you may want to control the positioning of the cursor:

at-xy       x y –         unknown       “at-xy”

In order to know where to position the cursor, it is often helpful to know the size of the screen:

form              unknown       “form”

And sometimes you want to use:

page              unknown       “page”

Note that on non-terminals you should use 12 emit, not page, to get a form feed.