I finally figured it out, after altering the Listen parameter in httpd.conf
So, from start to finish, for others who might be looking for a solution on Windows 7 Home Premium 64-bit with a recent version of WampServer:
Windows Firewall - add 4 Incoming rules to allow Ports 80 and 81 for UDP & TCP
Wireless Router admin panel - (quasi optional) assign IP addresses to various devices in
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