At work we've got a KVM which links together 6 servers.  It's great; love it, etc.  At my workstation I've got 1 PC with dual monitors.  Next month I hope to get another PC, and I'd really love to keep the older PC.  I'd also love to have dual monitor access to both machines, but don't have the desk space for that.  Is there anything like a KVM which allows 2 PCs to be connected to it, with dual monitors for each?