在移动设备和服务器之间创建双向链接

I would like to create a link between a winMo device and a server, so that they can pass information back and forth to each other. I actually don't really know where to start, I've had SOAP, RPC and creating a TCP link suggested to me. If someone could provide a link to an example that would be great.I would like to create a link between a winMo d