What is the OPEN buttom ij the HSD screen?

[Tinchus2009]

Hi. Anyone known what is this for? There is a buttom on the left of the HSD MFCD screen, called "open" and can be changed to PRTY. I can see what it does

[J20Stronk]

RWR prioritization. OPEN will show the last 20 emissions regardless of how much of a threat they are.

 

PRTY will limit the amount of threats displayed to only show what the RWR believes to be the biggest threats based on several factors. (Emitter class, type, strength, etc.)