double-grided mouse pad (vertical lines on the top half and horizontal
lines on the bottom half). This mouse (model Q500) is NOT
PROGRAMMABLE and has no installation disk, since it uses only the
standard windows drivers that have been with us since windows 3.1, and
gives you a HARDWARE solution for the double-click action, which is
the 3rd (middle) button. This mouse is probably about 8 years old and
is now intermittently malfunctioning. I have looked for another one
and I am exhausted - all the new ones are "programmable", which means
the middle button is not a hardware implementation of the double-click
action. I seem to remember that there were maybe three different
models for this type of mouse, maybe PCmouse, Littlemouse, and the one
I have, the Q500.
They have TWO optical laser emitters, one which glides over the top
half of the mouse pad (where the veritcal grid lines are), and the
other which glides over the bottom half of the mouse pad (where the
horizonal grid lines are), and you just have to keep the mouse
situated so that the top part of the mouse stays on the top half of
the mouse pad and the bottom half of the mouse stays on the bottom
half of the mouse pad. It is very easy to work with, and, the real
major feature is the built-in hardware double-click button. You don't
have to install anything - just click the 3rd button and it generates
the necessary double click (for the left button only). If anyone
knows whether or not they still make this kind of mouse, please
respond. It is the hard-wired double-click aspect that I consider to
be the "must-have" feature. Thanks, littleberry