The original addon linked uses RealID to connect cross-realm and says so in the description. Using such methods can open up a can of worms that isn't strictly legal as far as Blizzard is concerned.
In order to work, you need two people on separate realms who share battletag/real ID to put "#guild" as the note for that friend.
Player A puts "#guild" as the note for Player B Player B puts "#guild" as the note for Player A
Everything said in Player A's guild chat is pasted into Player B's guild chat and vice versa.
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http://wow.curseforge.com/addons/inc...ealm-guild-ch/
Rules Related to "Chat" and Interaction With Other Users. Communicating in-game with other Users and Blizzard representatives, whether by text, voice or any other method, is an integral part of the Game and the Service and is referred to here as "Chat." When engaging in Chat, you may not:
(i) Transmit or post any content or language which, in the sole and absolute discretion of Blizzard, is deemed to be offensive, including without limitation content or language that is unlawful, harmful, threatening, abusive, harassing, defamatory, vulgar, obscene, hateful, sexually explicit, or racially, ethnically or otherwise objectionable, nor may you use a misspelling or an alternative spelling to circumvent the content and language restrictions listed above;
(ii) Carry out any action with a disruptive effect, such as intentionally causing the Chat screen to scroll faster than other users are able to read, or setting up macros with large amounts of text that, when used, can have a disruptive effect on the normal flow of Chat;
(iii) Disrupt the normal flow of dialogue in Chat or otherwise act in a manner that negatively affects other users including without limitation posting commercial solicitations and/or advertisements for goods and services available outside of the World of Warcraft universe;
(iv) Sending repeated unsolicited or unwelcome messages to a single user or repeatedly posting similar messages in a Chat area, including without limitation continuous advertisements to sell goods or services;
(v) Communicate or post any user's personal information in the Game, or on websites or forums related to the Game, except that a user may communicate his or her own personal information in a private message directed to a single user;
(vi) Harass, threaten, stalk, embarrass or cause distress, unwanted attention or discomfort to any user of the Game;
(vii) Participate in any action that, in the sole and absolute opinion of Blizzard, results or may result in an authorized user of the Game being "scammed" or defrauded out of gold, weapons, armor, or any other items that user has earned through authorized game play in the Game;
(viii) Communicate directly with players who are playing characters aligned with the opposite faction (e.g. Horde communicating with Alliance or vice versa); or
(ix) Impersonate any real person, including without limitation any "game master" or any other Blizzard agent or employee, nor may you communicate in the Game in any way designed to make others believe that your message constitutes a server message or was otherwise posted by any Blizzard agent or employee.
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http://us.blizzard.com/en-us/company/legal/wow_tou.html Section 7.2