Here is the scenario... I need to capture/record the computer output from a teachers computer in order to archive it for a later date.

When the teacher is giving his slides and moving the mouse around and opening windows I need to record all of this activity.

Can it be done w/ a standard capture card and computer?
What software might be able to do this?
Can I capture files onto the computer I would like to capture? i.e. loop back into the same computer
What would a file size be for 45 minutes worth of computer video?