A4Tech NB-50 User Manual page 6

rd th th
Programmable 3 , 4 and 5 buttons – more than 54
available shortcuts
Button assignment lists out of 54 available commands and settings for the 3 ,
rd
4 and 5 keys which you can open many useful programs or execute the
th th
commands by one click on the button.
The default setting for the 4 and 5 buttons is Internet Explorer and Browser
th th
"Back" and "Forward" function.