|Your Google is as good as mine on the screensaver LOL.|
Harping back to the original question, I'm not sure how well up you are on keyboard commands (such as Ctrl+A already given).
You might sometimes want to highlight a selection of files (for moving or deleting):
If you want to highlight a block, highlight the start of block with the mouse left click, then go to the other end of the block, hold down the Shift key and left click the other end.
If you want to add or subtract the odd file to a selection, then in the same manner hold down the Ctrl key then left click each file you wish to highlight.
In all cases, once you've got your selection highlighted you right click any one of them to cut, delete or whatever.
These three can sometimes be handy too:
Ctrl+X is "Cut"
Ctrl+C is "Copy"
Ctrl+V is "Paste"
The last one is particularly useful when you want to paste something in a box (such as registration key) when there is no Paste facility provided.
You might know all that but I thought I'd add it just in case. There are stacks more.
some other bloke...