I have started doing some iPhone development but I am generally pretty new to the Mac world so please excuse my very basic and ignorant questions. I am trying to install a packet sniffer (WireShark) on my PowerBook and the instructions say that I need to drag the contents of a folder that is a included in their distribution to /usr/local/bin or $HOME/bin. First, I don't know what $HOME refers to in this context, and second it appears that /usr/local/bin and several other directories they mention are not visible to the average user (that is, Finder does not show them.) But I can find them in Terminal so I assume that they are just hidden for to protect them from the not-so-clever users. So, I am curious first about the instruction to drag and drop into these folders, when the destination is not visible in Finder. Is there a way to unhide hidden folders? Or is there some other way to drag something into these folders? Or was the person who wrote those instructions just not thinking and I need to use Terminal and copy the stuff I need in the old-fashioned Unix way?