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spec: It is important that this is not a criticism of current interface design , but instead an intrinsic problem of interaction . " The biggest problem is the risk associated with transitioning from pilot line to successful commercial production , " says Ken Zweibel , who heads up thin-film research at the National Renewable Energy Laboratory ( NREL ) in Golden , CO. " There 's a tremendous amount of manufacturing development implicit in that - - and it 's always underestimated by outsiders . Anyway , what you 'd like to happen is to have a way to send a message so it pops up on the other person 's screen , stays there for 5 minutes or so , and then disappears with no trace or log entry . This technology , developed by a team at the National Renewable Energy Laboratory ( NREL ) , fills the need of wireless operators to provide higher quality and more reliable service to an increased subscriber base .