Cover-Extend Technology is a limited access solution for in-circuit test. Is said to eliminate the need for physical test points. Is part of VTEP v2.0 Powered test suite. Is a hybrid between Boundary Scan and VTEP Vectorless Test. Relies on stimulus provided by Boundary Scan cells. Benefits reportedly include improved test coverage (up to 50% node access); savings on fixturing, and strain relief on solder joints.
 
Agilent Technologies Inc., www.agilent.com