# File lib/poll.rb, line 341
        def handles( eventMask=nil )
                if eventMask
                        eventMask = eventMask.to_i
                        @masks.find_all {|io,evmask| (evmask & eventMask).nonzero? }.collect {|io,evmask| io}
                else
                        @masks.keys
                end
        end