You should run it from the hacuser@hacsb2 console in the same way you run the regular AlarmHandler. Go to the red toolbox menu on the panel at the bottom of the screen (Fig 1) and choose 'IHWP-alarm-handler'.
A resizable button will pop up (Fig 2), start flashing red, and playing an audio message via hapc7's speakers. Clear the alarm by clicking on the button and it will be silent until the next IHWP EPICS variable next changes state.
g2p people may want to put these instructions in the g2p wiki.
Bug me at brads@jlab.org if it doesn't work.
Figure 1
Figure 2