By pressing a combination of keys, you can do things that normally need a mouse, trackpad, or other input device.
There’s no getting around it: the Mac App Store is slow. If you try to avoid opening it whenever possible, you’re probably pretty annoyed when you see the update notification in the menu bar. You’ve got to open the App Store, click the “Updates” button, and wait while the application is “Checking for Updates.”
This will run through the process of downloading Mac App Store purchases so you can deploy to other clients and machines within the organisation.