Abstract: A user's home computer is backed up over the Internet or other network to a host computer site to create a virtual copy of the home computer at the host computer site. The user can then access the virtual copy over the Internet or other network using a remote access client computer, which can be any computer having a Web browser and a compatible remote computing protocol. In response to user commands from the remote access client, the host computer executes the applications of the virtual copy of the home computer and returns the results to the remote access client, with the user thus controlling the host as though the user were operating the home computer.

Abstract: A system for detecting the presence in a sampled composite signal of an identification signal having a predetermined frequency without falsely recognizing other sharp signal transitions in the sampled signal as the identification signal.

Abstract: A method for temperature compensating the output of an oscillator circuit and apparatus for performing the method. This method employs fractional cycle synthesis to maintain the output frequency of a voltage-controlled oscillator at a desired value, the reference frequency of the circuit being derived from a crystal oscillator. To calibrate the circuit, the crystal oscillator is cycled in temperature. The frequency output of the crystal oscillator is accurately counted while a digital signal representing temperature is generated by an analog-to-digital converter from a temperature sensor. A signal representing the relationship between crystal frequency and temperature is stored in a memory and is available during actual operation of the oscillator for temperature compensation.