Recently active topics in Pownce tagged with show filter

when i recieved a private message, it shows as a private message. When I reply to it, is the reply private too? or is it public?

I tried to see that by filtering the messages using the "show" filter on the home page. But got confused between "Private" and "non-Public", aret they the same?? or should that be "Private" and "Public" options?