Alienware 18 Area-51 AA18250 palmrest junction board- this is the keyboard controller board, often referred to as the keyboard MCU (micro controller unit) board, this also acts as a junction board connecting the keyboard to the motherboard.
Compatible Dell Laptops:
Alienware 18 Area-51 AA18250
DPN: KX49T
alternate part numbers:
JDP80
LS-N808P