JRC JAN-701B Instruction Manual page 527

2) In the [Option1], [Option2] and [USER] key
Multi Window function can be assigned to the [Option1], [Option2] and [USER] key.
Select [MENU] - [(7) Main] - [(0) Setting] - [(2) Option Key Setting] in that order.
The [Option Key] dialog box will be displayed.
After registering, push the assigned key.
OPTION OPTION
USER USER
1 1
11-3
OPTION OPTION
2 2
11 Operation of Multi Window
Multi Window