SSID Broadcast suppression features - can someone clarify it for me ?

I'm looking at the SSID configuration and I was wondering about Broadcast suppression - 

1.what are the thresholds ?

2.I undertand what ARP poison means (I am a CCIE after all), I understand ARP proxy.

yet I don't understand the following - 

ARP replies - does it block ARP reply which is in broadcast ? after all ARP reply is unicast.

ARPs for known clients ? does it block ARP reply from a known client ? does it block traffic intra SSID ?

DHCP downlink ? does my 40F can still work as DHCP server ?

DHCP unicast ? what does feature mean ?

DHCP uplink ? does it mean DHCP Snooping ? does it mean that the client can't request for DHCP ?

can anyone provide me recommendation and explanations ?