Format of TopView field table header:
Offset	Size	Description	)
 00h	BYTE	number of fields (must be <= existing number of fields)
 01h	BYTE	screen behavior bits (see #00443)
 02h	BYTE	current input field (updated by DESQview)
 03h	BYTE	current select field (updated by DESQview)
 04h	BYTE	attribute for select fields when they are pointed at
 05h	BYTE	attribute for select fields which have been selected
SeeAlso: #00440,#00444