hand held slide advancer

I am sharing an in-house presentation on an Epson overhead projector/screen which is for the dedicated powerpoint slides. I am working off of a laptop PC for accepting invitees and answering chat. The two screens are identified as 1 and 2 (1 is the laptop, my main display, and 2 is the projector for the powerpoint presentation). My issue is when I use my laptop keypad, the presenter is unable to advance the PowerPoint Slides. I have to select or click on powerpoint to give the control back to the remote clicker/slide advancer. How can this be remedied with settiings?