silverlight duplex communicates with self-hosted wcf services cross-domain problem

I have a silverlig开发者_开发知识库ht4 application which needs to call and be called back the wcf services self-hosted in a local windows-form application. I wanna use the net.tcp protocal to achieve the duplex communication but encounter cross-domain problem. It's easy to find solutions of the cross-domain problem but most of them is for the IIS-hosted WCF services.How to solve the cross-domain problem of a net.tcp WCF Service which is self hosted in a local windows-form application?

The solution is listed at the blog post at Enabling cross-domain calls for SL apps on self-hosted TCP services. Basically, if you have IIS installed on the machine you simlpy drop the cross-domain file for TCP in the root. If not, you can use the same self-hosted WCF service to serve the cross-domain file at port 80.