Trying to create a direct link to an IRC channel with double octothorpes (##).

Freenode policy dictates off-topic channels require ## before the channel name.

This O'Reilly 'hack' post gives solid instructions for how to link to a channel and open in the default client on a system, but no guidance for channels with doubles.

Links to single channels are formatted as "irc://irc-server:port/channel?key"