Optoma LR4 - Manual (Page 13)

LR4 User Manual Chapter 2 LR4 Menu Display 9
2.2 On-Screen Display (OSD) Modes
LR4 has four modes of operation. Press the Power/Mode
button to cycle though the different methods of using the
controller.
2.2.1 KEYBOARD (K/B)
Press the Power/Mode button until K/B is highlighted on the OSD.
1
2
3
4
ALT
TAB
PgUp
PgDn
ESC
F5
ALT + TAB
TAB ALT
Enter K/B mode to replace the computer keys.
Press ALT and then press TAB to scroll through open
windows and programs.
ALT, TAB, PgUp, PgDn, ESC/F5 also replace their
keyboard equivalents.
The right-hand multifunction navigation pad button turns
the screen blank.