because ping is a command to test the message delay in irc, and it is used for the same purposes in msn (thanks to msgplus
![:)](images/smilies/msn_happy.gif)
) and perhaps even to catch the eye of the contact, one cannot pong themselves since pong is the response to ping, therefore one cannot get a response to a response
![:P](images/smilies/msn_tongue.gif)