Here's our Windows 95/98 Tip for.. January 26, 1997
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Left mouse button drag and drop
You have no doubt by now discovered that you get some very different actions during file operations depending on whether you use the right or left mouse button. We recommend using the right mouse button because it's harder to make a mistake when you're presented with a drop-down menu, which you always get using the right button. But for those of you who want to understand the differences, here's what the left button does:

Left-dragging objects from one directory to another on the same drive results in a move. Holding down while using left-drag forces a move regardless of the source or destination. Left-dragging objects from one directory to another on a different drive results in a copy. Holding down while using left-drag forces a copy regardless of the source or destination. Left-dragging an executable file to a new directory results in a shortcut to that file.

Small annotations on the icons while dragging will indicate the drop behavior: a plus sign for copy, a hooked arrow for a shortcut, and no symbol for a move. Pressing in the middle of a drag aborts it.