Switching from External to MBP Screen?

[jamin.]

How can I quickly switch from my External Screen to view the MBP Screen, without pulling out the DVI Cable?

 

[digitalpencil]

What do you mean by switch? Change which is the primary display? If so, there's no quick way of doing so, you just have to open display prefs and drag the top bar to the other display. You might be able to write an applescript to automate the process though.