Abstract: A computer system including a computer network, a multiplicity of network enabled portable computers, each including at least one sensor for sensing an operational status aspect thereof and a communicator for providing status information via the network and a maintenance center communicating via the computer network with the multiplicity of portable computers and being operative for automatically receiving the status information and for providing maintenance directives based thereon.

Abstract: A computer system including a computer network, a multiplicity of network enabled portable computers, each including at least one sensor for sensing an operational status aspect thereof and a communicator for providing status information via the network and a maintenance center communicating via the computer network with the multiplicity of portable computers and being operative for automatically receiving the status information and for providing maintenance directives based thereon.

Abstract: A method for recording an experiment performed in an educational environment, including measuring data from the experiment at a plurality of times using a data logger, generating, using the data logger, respective indications of at least some of the times, and generating an audiovisual (A/V) record of the experiment. The method further includes incorporating the respective indications into the A/V record so as to form an annotated A/V record, storing the data and the annotated A/V record, recovering the respective indications of the times and a selected portion of the A/V record from the annotated A/V record, generating respective experimental results from the data responsive to the respective indications of the times, and storing the selected portion of the A/V record and the respective experimental results as an experiment report.