HowTo Filter events by Trigger Bits

Filter events by Trigger Bits is available in on-line event display - mon.
This is the feature of ConsumerInput module. 

How to use it: 

                root[0] .q
                AC++>   talk ConsumerInput
                ConsumerInput> anyLevel1Bit set false
                ConsumerInput> level1BitList set 21
                ConsumerInput> exit
                AC++> begin -nev 1 
                AC++> root

Now you are back in the root prompt and Event Display "sees" only events 
having 21th level1 bit fired. You can set a list of required level1BitList.
They are ORed.