It’s an easy and clear way to record your students’ homework records.
Most importantly, you can show this to your kids every lesson to motivate them.
If you need to capture any pictures / areas you see on your screen on Windows, try this built-in tool: Snipping Tool
More:
http://windows.microsoft.com/en-us/windows7/snipping-tool-frequently-asked-questions
http://windows.microsoft.com/en-AU/windows7/products/features/snipping-tool