Prints some subset of the current verb text.
The default range is some reasonable collection of lines around the current insertion point: currently this is 8_-8^, ie., 8 lines above the insertion point to 8 lines below it unless this runs up against the beginning or end of file, in which case we just take the first or last 16 lines, or just 1-$ if there aren't that many. (See `help ranges' for how to specify line numbers and ranges.)
`nonum' prints without line numbers.
Yes, window heights will be customizable some day.