How to connect to a Hyper-V guest, from an other, remote PC

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http://serverfault.com – I have installed a Windows Server 2008R2 SP1 Datacenter edition, and I have added the Hyper-V role, with RemoteFX. Installed a Windows 7 Ultimate x64 with SP1. Updated the additions, enabled RemoteFX. But... how do I reach the guest? Okay that I have to enable remote desktop. Did so. Even changed the port on the guest. But how would one reach it from outside? Is there a NAT configuration applet, application somewhere, where I should forward it's port to the outer network? (HowTos)