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Reliably, quickly, and intuitively transmitting complex commands to Small portable computers can be difficult. Small computer devices do not generally have Sufficient computer processing power to respond reliably to Voice or handwritten (pen based) commands, keyboards are often absent or too Small for accurate finger input, and conven tional buttons are too large or Support too limited a com mand instruction Set. User interface techniques that rely on bulky external modules (full size infrared linked keyboards, tethered data gloves, or camera based gestural recognition equipment, for example) are expensive, often not readily available outside Selected Sites, and probably too awkward for widespread use in conjunction with consumer level portable computing devices. User interface designers for portable computers have attempted to compensate for Some of these problems by constructing devices that rely on …