Use left or right mouse button to draw (just for fun) in DOS.
The point is to demonstrate the use of mouse in DOS using mouse interrupt
33h from assembly language. The assembly language function can itself be
called by compiling the assembly language program as a binary file and using
CALL ABSOLUTE in QuickBASIC, or by compiling the program as a library that
can converted to a Quick library (QLB) and declaring the subroutines and
functions.
