The ClientHost property returns the hostname of the current
client session which has established a connection with the server.
This property value is only meaningful when accessed within an event
handler, such as the OnConnect event.
Accessing this property causes the control to perform a blocking
reverse DNS lookup, attempting to match the client Internet address
with a hostname. Not all addresses have a reverse DNS record, in
which case this property will return an empty string. It is
recommended that most applications use the value of the
ClientAddress property rather than use the ClientHost
property to distinguish between client connections.