This locker (sipbnet) contains various networking tools not conveniently available elsewhere on Athena (either as part of the release, the net-tools locker, the sipb locker, etc., etc.) Windowed ping (mping) is here, but is under somewhat tight access restrictions. If you have a need to use it, please send me, , mail. Documentation for it is in papers/WPing.ps (sorry, only postscript form). --jhawk@mit.edu. John Hawkinson