source files: xgtm.[ch], term/*.trm, gtplot.h
(GT-SLEEP <fix:seconds>) (SEND <gtm:terminal> :SLEEP <fix:seconds>)
Pause the process for given number of seconds. Useful when external hardware must be given a certain amount of time to settle down before it can respond intelligibly -- the Panasonic and LyonLamb boxes both need a few seconds after NTSC video is established before they are sane.