The standard-mode grabber is a binary-image file, not an executable file. The
grabber is built by assembling and linking the sources and converting the result
to a binary file using the exe2bin command.
Since Windows cannot relocate segment addresses in binary-image files, the grabber's code and data for the grabber should be combined in the same segment (tiny memory model). To support this model, Windows always sets the DS register equal to the grabber's code segment address before calling any grabber function. This means the DS and CS registers are equal when a grabber function is first called.