Depends on what you're checking. A piece of window glass works well for checking push rods for straightness. A machinists straight edge is good for checking heads and decks.

It works by checking the windows network for any updates for your operating system and updates it for you.

The window when you boot up your computer is called the POST, Power On Self Test. It is bascially checking that all of your hardware is connected and has power.

After closing the window and checking the door, Scrooge went back to bed and fell asleep.

If you open two browsing windows, and in each window pull up the checking accounts you wish to compare, you can view them side by side.