The most valuable site out there in regards to RETS information is www.RETS.org. They have tons of information about RETS including resources for developers.

Realcomp's RETS server is compliant with the 1.7 specification and will support RETS clients of 1.5 or 1.7.

For more information about the types of RETS access available, check out our Data Access & Syndication page, call Customer Care at 866-553-3430, or email our Data Access & Compliance Specialist at IDXSupport@realcomp.com.