Dual task pedormances were investigated as a function of the location of a peripherally-mounted miniature CRT which presented secondary task infomiation. The miniature CHT's location was varied across three levels of elevation and four levels of azimuth. Primary task information was presented by means of a stationary, centrally-located CRT. The primary task required continuous monitoring of the primary display. while the secondary task required continuous tracking of an object on the secondary display. The results indicated that (a) Performances on both tasks declined as the display separation along the azimuth increased: (b) Performance decrements were greater when upward eye shifts were required to view the secondary display than when the corresponding downward eye shifts were required: and (c) Subjects' ratings of discomfort were similar to the general pattern of performance decrements. Implications of these findings for the design of secondary displays are discussed.