Epson BrightLink 450Wi Quick Manual page 15

6. Continue until all of the circles are black.
After you have finished calibration, you can use either pen as a mouse on the
projection board or wall. With additional software, you can also use the pens to
write or draw on the projected image. You can use any annotation software you
have or Easy Interactive Tools, as described on page 17.
15
Calibrating the Projector