OverSpy captures all online conversations, web sites visited, all emails sent and received, all keystrokes typed, all computer operations and opened documents, and takes screenshots every few minutes.
All this is happening in full stealth mode so the person you are monitoring will never be aware of it.
OverSpy takes screenshots at configurable interval. Then you can preview what had happened on the PC in a movie-like mode. In a list at the bottom will be shown all monitoring data that had been gathered when the screen capture had been taken. This is as close as possible you can get to the real action.
Using OverSpy you will know everything that happened on the monitored computer. But may be you want not only to know it but block some activities from happening altogether? You can use the Filtering feature. Prevent the user to visit specified web sites, stop programs you don't want to be started or completely restrict certain users from using the PC.
You can safely leave OverSpy running for weeks and check what have been monitored after that. But wouldn't you prefer to get reports on the gathered information? OverSpy has Reporting By Email feature that will keep you informed even if you do not have physical access to the PC.