I have noticed that sometimes LR opens with a catalog that does not include all my images. Looking in my hard drive, I see there are multiple places (not knowingly created by me) where photos are saved. If anyone can enlighten me about how LR "thinks", I would appreciate it very much.
For instance, the "file location" of the desktop link is: (C:) > Program Files > Adobe > Adobe Lightroom
I also make backups to two different locations: (D:) > Lightroom 4.4 Photos > 2015 folder - the LR 4.4 folder is also the location where images automatically get stored in appropriate folders whenever I import from my camera
(K:) > 5 - 2015 folder
But I have discovered other folders as well, sprinkled around (C), containing some images, but not a complete catalog. Because of other problems I have had with trying to organize things, I am afraid to do it without knowing the proper procedure. It would be nice to "clean up" the disorder.
The main thing I want to know is from what location the program opens when I click on the link. And also would like to know where my missing images might have gone!
If you have multiple catalogs they are usually accessed from the menu:
File >> Open Recent
After you open each catalog go to:
Edit >> Catalog Settings
You will be able to see the file path.
Unexpected folders with images on your C: drive might be because you (accidentally) told Lightroom to copy or move your photos to that location. If the photos indeed have been imported into Lightroom that way, then you should be able to go to your folder panel in Lightroom (it's on the left) and find that exact folder(s). If you don't find it, then the photos are not imported into LR, and you can move them or delete them using your operating system. If you do find the folder in the Lightroom folder panel, then the photos have been imported into LR and you can manage them from within Lightroom.
Please take some time and view some introductory tutorials about Lightroom