Compositions of matter comprising computer readable media storing a computer program comprising instructions that, when executed, cause a computer to perform operations related to the monitoring of usage of a computer. In various aspects, the operations may include the steps of associating an identified user with a computer, and capturing an image of a monitored region of a computer screen of the computer at a specified time. The operations may include the steps of extracting image text from the image, determining image text content of the image text, and capturing a subsequent image of the monitored region of the computer screen of the computer at a subsequent time-subsequent to the specified time, in various aspects. A time difference between the specified time and the subsequent time is dependent upon image text content of the image text, in various aspects. The identified user does not control the associating step, the capturing step, the extracting step, the determining step, and the capturing a subsequent image step, in various aspects.This Abstract is presented to meet requirements of 37 C.F.R. §1.72(b) only. This Abstract is not intended to identify key elements of the methods, systems, and compositions of matter disclosed herein or to delineate the scope thereof.