Screen Grabbing Activity Tracker

Normal activity tracking software requires APIs for every application used on, e.g., a windows system. I need, for use in my services business, a screen grabbing software that tracks everything I do. The software would recognize, visually, which window is active, and be able to create a time sheet, which logs activities on the computer as personal or assignable to certain CLIENT FILES. Tracked activities include: - reading and writing emails (looking at the window title & subject line, which has the CLIENT FILE name) - editing word documents (looking at the window title, which has the CLIENT FILE name) In addition, if time is spent away from an application that is not tracked (e.g., time spent browsing, if Chrome is not tracked), then before shutting down, the user will be prompted to specify what he has done in the meantime.