input to the system 100 thereby enabling various functions that would normally be performed by a computer mouse but without any necessity of electrical communication between the system 100 and the laser pointer 118 the user could point click the laser pointer 118 at an application 39 s action icon projected on a screen 110 just as if he was using a mouse e g powerpoint has arrow icons that you can click on to advance to the next slide by modifying the laser pointer 118 to modulate its output e g toggle between on off states upon the press of a button on the pointer 118 this modulation could also be detected by the system 100 and could effectively serve as the u201c click u201d functionality analogous to the click functionality of a typical computer mouse input device again however this approach has the advantage of not requiring electrical connection to and communication with the system 100 from the pointer 118 real time image processing capabilities may be provided such as by a digital signal processor dsp to detect movement of the laser light spot 120 from the laser pointer 118 such processing capabilities may be provided by the integrated processing electronics hardware 112 and software 114 embedded within the projector 102 as previously described as the projector 102 projects an image 108 onto a screen 110 the projection screen 110 functions like a smart board the presenter may use the laser pointer 118 as a normal laser pointer 118 by pushing a first normal operating.