So since I have a few tablets now I realized there are some differences to how you enter bios and such. So this is a list of mine and others I have played with.

Dell Venue Pro 8

Diagnostics:

1. Power on the device
2. Press and hold the volume up (+) button

BIOS:

1. Power on the device
2. Press and hold the volume down (-) button

Boot menu:

1. Power on the device
2. Press the volume up (+) button quickly and release

Surface Pro 2 (Probably most Microsoft Surfaces)

UEFI settings:

1. Turn the machine off
2. Press and hold the volume up (+) button
3. Power on the device
4. Just before the Surface logo appears release the volume up button

Boot from USB:

1. Turn the machine off
2. Insert the USB memory into the computer, make sure it UEFI bootable.
3. Press and hold the volume down (-) button
4. Power on the device
5. Release the volume up button when the Surface logo appears

Screen capture:

1. Press and hold Windows button. The button that takes you to the start menu.
2. Press the volume down key on the left side of the surface
3. The screen should dark flash for a second to show that it is done.