Alter Aeon Online Help

Keywords are:  '% channel key chkey broadcast receive'

%chkey <secret key>

The 'channel key' allows channels to connect between muds.  In order
for this to work, you must:

1) create the exact same channel on both muds
2) on both muds, set the channel key to the same secret value

A good way to disconnect a channel if it is being abused by a remote
mud is to change or remove the channel key.