Keywords: Graphical user interfaces, multilevel security. High assurance graphical user interfaces must walk a fine line between providing user-friendly features and providing so much functionality that the trusted portion of the user interface can no longer be considered "minimal. " This paper describes the user interface provided b y TRW's Trusted X prototype and some of the tradeoffs made in ais construction.' 1063-9527/93 $3.00 0 1993 IEEE
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