Running ENVI on MacOSX: Should I be able to cycle through linked displays with a 1-button mouse? I can't discover how to emulate "MB1 + MB2", the combination needed to toggle through linked displays. MB2 is itself emulated by pressing Option key with a mouse click (ie with MB1). Pressing Option or Command keys while clicking the mouse emulates 2nd or 3rd mouse buttons just fine - but how is the simultaneous clicking of two buttons emulated?