04/08/93: *SGI*: Entry level SGI Indigo doesn't support emission in display list correctly
	but it is correctly done on Elan and XS	
06/08/93: *GTS GRALPHIGS*: Currently only one PixmapDisplay supported
16/08/93: *RT*: no support for visual feedback of input. Does anybody need that?
28/03/94: AIX 3.2.* compile problems:
	src/input/event.h: time() instead of time( NULL )
	src/tclerror.C: va_end( args ) 
13/06/94: *X11* shader: no support for concave polygons
