A gas turbine engine turbine blade has cooling air holes arranged in groups, the holes in one group and which span that part of the leading edge that spans the hottest part of the blade, are more closely spaced than the remainder of the holes, thereby ensuring the provision of the most cooling air, where it is most needed. A preferred embodiment of a symmetric multiprocessor system includes a switched fabric for data transfers that provides multiple concurrent buses that enable greatly increased bandwidth between processors and shared memory. The panel has a group of apertures through which the plungers are movable into actuating engagement with the switches upon such multi-directional movement of the key. The pressure is then significantly reduced on the liquid refrigerant as it transits through the capillary tube.