different between two labview examples

what is the difference two labview examples

1, ...\examples\DAQmx\Counter\Measure Period or Pulse Width.llb\Meas Buffered Semi-Period-Finite.vi

see labview1.jpg

2, ...\examples\DAQmx\Counter\Measure Period or Pulse Width.llb\Meas Semi-Period.vi

see labview2.jpg

what is the Buffered meaning here? and what is the condition of NOT Buffered?

thanks in advance