Well...this is short and sweet! :-)
Recently, I was surprised to find several people that did not know this little tidbit, so I thought I'd share. Plus, it's a nice addition to my last post about drag and drop in case you use a folder for the target.
If you want to add a Lotus Notes document to a folder while keeping it in the current folder, just press the "Ctrl" key while you do so. Just like in Windows Explorer, you'll notice that the cursor changes slightly to denote that you are "copying" the document to the new folder rather than just moving it.
Like I said...short and sweet [insert obligatory short Notes developer/admin joke here...there's a bunch to choose from! ;-D ]