Appletviewer with no parameter can't exit successfully when run first time, and
need to use ^C to exit, while run second time is ok. detail:

   ### test config jdk1.2.2_07, Solars7 i386, zh locale.
   ### run first time
   %appletviewer
   ### display a copyright window -> click "accept"
   No input files specified.
   usage: appletviewer [-debug] [-J<javaflag>] [-encoding <character encoding type> ] url|file ...
   ^C
   %
   ### run again
   % appletviewer
   No input files specified.
   usage: appletviewer [-debug] [-J<javaflag>] [-encoding <character encoding type> ] url|file ...
   %