Ever need to temporarily reference another document while working on something – this may be an image, or instructions, or a PDF file. Many times you want it floating right on top of your current document so you can refer to it while you are working, and not have to switch back and forth between applications.
I do this a lot when working in Illustrator, especially working from reference images, but also the occasional email message or PDF file sent by a client.

Here’s a pretty handy little reference graphic: an
So you’ve just made a selection in Photoshop using the Marquee tool, but you didn’t start in the right place and one of the corners isn’t covering part of the area you want selected.
