Panasonic KX-TD500 System Reference Manual page 727

<Type 3>
This function field is available for concluding Help screen and switching to another
screen as selected by a function key.
Type 3
F1
(LOOP & TRG)
F2
(Extension Manage)
F3
(Pickup G. Manage)
F4
(CO Manage)
F5
(Attendant Manage)
F8
(Function Select)
LOOP & TRG
Extension
Management screen
Pickup Group
Management screen
CO Management
Attendant
Management screen
6-C-39
screen
screen
Type 1