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Hybrid Remote Edge Access Point, or H-REAP (now called FlexConnect), is the feature that allows you to deploy APs across WAN links so that the AP can fall back to standalone mode if the connectivity with the WLC is lost and perform local switching of the client traffic to give direct access to local resources to remote WLAN clients where the tunneling to the central site is not desired.
More information about the FlexConnect/H-REAP feature can be found in the following documents:
H-Reap Design and Deployment Guide: www.cisco.com/en/US/products/ps10315/products_tech_note09186a0080736123.shtml
Configuring Hybrid REAP: www.cisco.com/en/US/partner/docs/wireless/controller/7.0/configuration/guide/c70hreap.html