What are the requirements for setting up a representative office in Thailand under Free Trade Agreements?

Does any one have any experience and knowledge in relation to Free Trade Agreements and the setting up of a representative office in Thailand?

"Treaties: Nationals of the relevant signatory countries to bilateral treaties with Thailand are accorded the same status as Thais under the FBA in respect of certain restricted businesses. As at the date of this publication Thailand has signed relevant bilateral treaties, with the US, Japan and Australia. "