TC: void far getimage( int left, int top, int right,
				 int bottom, void far *bitmap )

	- prototype in graphics.h

	- copies video data from the screen rectange to buffer "bitmap"
	- bitmap must be large enough to hold entire buffer plus 4 bytes
	  (2 words) for height and width information.  Function imagesize()
	  should be used to determine the size of the buffer to avoid
	  overwriting adjacent memory.

	- MS C uses _getimage()
	- see	putimage()   imagesize()