Program sending an XML message to IP

Hi every body,

I have to create two programs; I think these are easy to do but I have not work until now with XML messages.

These programs have to be the interfaces with another non-sap system.

• In the first interface I have to generate and XML message and send it to an specified IP address.

• In the second interface I have to receipt xml messages from this IP address.

I have not XI as middelware ; do you know some functions to do it?

Thanks in advance.