Bitfields for TopView screen behavior bits:
Bit(s)	Description	)
 7	reserved
 6	menu items may be selected via keyboard
 5	left mouse button in "status" mode (press anywhere in window
	  immediately returns control to application)
 4	right mouse button in "status" mode
 3	select fields return contents or blanks rather than 'Y' or 'N'
 2	modified bits reset on return to application
 1-0	type of data returned
	00 no data returned on read of keyboard
	01 data returned as array of characters containing all fields packed
	      together, with no field numbers
	10 data returned as numbered variable-length records for all fields
	11 data returned as numbered variable-length records for the fields
	      which were modified
SeeAlso: #00440