To borrow source code or download graphics use your right mouse button to open a menu of selections. If you wish to view source code, right-click on a clear area of the background. Good old IE launches a separate Notepad document you can save with a new filename to examine at your leisure. If you are interested in capturing an image, right-click on the image. Choose "save image/picture as." It's usually good to rename the file, especially if it's called something like 0018dr.jpg .
To capture some text, highlight it with your mouse and copy it using <Ctrl>-c. Paste it into a document using <Ctrl>-v.