Dell 1610HD - Manual (Page 45)

Using Your Projector 45
a Go to Others menu, press on the control panel or press Enter
button on the remote control and then select Password to Enable
the password setting.
b Enabling the Password function will pop up a character screen, key
in a 4-digit number from the screen and press on the control
panel or press Enter button on the remote control.
c To confirm, enter the password again.
d If the password verification is successful, you may resume with
accessing the projector's functions and its utilities.
2 If you have entered an incorrect password, you will be given
another 2 chances. After the three invalid attempts, the projector
will automatically turn off.
NOTE: If you forget your password, contact DELL™ or qualified service
personnel.
3 To disable the password function, select Off to disable the
function.