SHOW_MOVIE@ opens the given .AVI file and shows it in a window. If OPT is zero,
the user must click the play button to start the movie. If OPT is 1, the movie
starts immediately. Do not call this routine with a file which does not exist -
if necessary check in advance.
When SHOW_MOVIE@ returns, the movie window will be displayed and will be under
the user's control. The MOVIE_PLAYING@ function can be used to determine when
the user finally closes the window. If a second call to SHOW_MOVIE@ is made
before a previous movie has finished playing, Clearwin+ will wait until the
first movie completes.
Movie files can include a sound track, which will be played if a sound card us
installed in your PC.