Ports are ports. They are essentially, "imaginary". What you are asking
depends on the software that is *controlling* the flow of traffic to/from
any specific port. The controlling software (usually a router or a firewall,
or both) can allow/disallow traffic either in, out or both ways, through
this imaginary port.

-Frank

"Peter Eisenman" <psallach@landsend.com> wrote in message
news:436dfc5f$0$21941$9b4e6d93@newsread2.arcor-online.net...
> Assume we look an a certain port say, port number 1234.
>
> Are there TWO different ports 1234 - one for the outgoing direction and
> one for the incoming?
> Or is there only one port which can be used only in one direction at a
> certain time: either
> as incoming or outgoing?
>
> If the ladder would be true then an already established incoming
> connection on port 1234 would block
> any outgoing connection on the same port.
>
> Peter