The Windows 8 Metro Start screen contains small squares and rectangles, called tiles, that are used to represent various programs that you can access. The default tiles that are on your Start ...

The default keyboard shortcut to pin any window to the screen is Windows Key + Control + T. (You can change this, if you want, in the Always On Top section of the PowerToys app.

You can add Portable Apps to Windows Startup by using the Startup folder, Task Scheduler, and freeware. This post describes how to do that.