Can not compare "roMessagePort" object

Comparing "roMessagePort" object always throws "Type Mismatch Error".

print CreateObject("roMessagePort") <> CreateObject("roMessagePort")
Type Mismatch. (runtime error &h18)

port1 = CreateObject("roMessagePort")
port2 = CreateObject("roMessagePort")
If port1 <> port2 Then
End If

How can I compare these?