> On Fri, 6 Feb 2004, Ernst Roebbers wrote:
>
>> Dear Sirs,
>>
>> I would like to communicate with the postgres backend
>> using port 5432 from a small remote machine where only
>> a socket is available - no application layer.
>>
>> Do You have any hints where I can find some information
>> what kind of input the postmaster needs?
>
>
There is a whole chapter on this at http://www.postgresql.org/docs/ .
Go there, select the version you're using and look for Frontend/Backend
Protocol in the Developer's Guide.