Abstract: In one embodiment, the present invention is directed to a method for providing an adaptive computer user interface. The method may comprise the steps of: monitoring operating system events associated with input from a user to generate a series of operating system events; determining whether said series of operating system events is unrelated; and when said series of operating system events is unrelated, offering help to said user.

Abstract: In one embodiment, the present invention is directed to a method for providing an adaptive computer user interface. The method may comprise the steps of: monitoring operating system events associated with input from a user to generate a series of operating system events; determining whether said series of operating system events is unrelated; and when said series of operating system events is unrelated, offering help to said user.

Abstract: In one embodiment, the present invention is directed to a method for providing an adaptive computer user interface. The method may comprise the steps of: monitoring operating system events associated with input from a user to generate a series of operating system events; determining whether said series of operating system events is unrelated; and when said series of operating system events is unrelated, offering help to said user.

Abstract: In one embodiment, the present invention is directed to a method for providing an adaptive computer user interface. The method may comprise the steps of: monitoring operating system events associated with input from a user to generate a series of operating system events; determining whether said series of operating system events is unrelated; and when said series of operating system events is unrelated, offering help to said user.

Abstract: The electrical drive pulse applied to the piezoelectric crystal of an ink jet printer is designed to cause ejection of a single desired ink droplet from the print head and to preclude ejection of unwanted multiple ink droplets. The drive pulse consists of the superposition of two waveforms wherein the first waveform causes ejection of the desired ink droplet and the superimposed second waveform removes energy from the print head so that mechanical ringing of the ink supply within the print head does not cause ejection of unwanted ink droplets.

Abstract: A digitizer propagates coarse and fine wavelength electric fields across a platen to perform phase delay measurements, the results of which correspond to a displacement of a cursor along a measurement axis. The time interval between propagating the longer wavelength coarse electric field at a high velocity and subsequently establishing and propagating a shorter wavelength fine electric field at a low velocity is minimized by pre-loading at high speed a propagation circuit with the pattern to be propagated as the shorter wavelength fine electric field.

Abstract: A cursor for a digitizer is selectively made to adhere to the digitizing surface by the controlled application of a vacuum to the underside of the cursor. The control can reside either in a manually activated switch on the cursor, or in commands issued to the digitizer by its controlling device.

Abstract: A digitizer shifts long and short wavelength square waves across x and y grids in a platen to perform upon a cursor signal time measurements that represent coarse and fine cursor position data. The periodic staircase cursor signal is filtered before use to permit time measurements that resolve cursor positions to locations between lines in the grids. The contribution of the filter to the coarse and fine time measurements is obtained in a special reference measurement, so that it may be removed. A processor combines these data into Cartesian coordinates, and implements procedures for error reduction. These include averaging of consecutive time measurements, dynamic adjustment of a timing reference to remove ambiguities inherent in measuring very small or very large cyclic quantities, and correction of coordinates for the effects of cursor motion during measurement and for any non-perpendicularity of the x and y grids.