@MarjaE - On Windows I use the PDF-XChange viewer for PDFs, I have it configured to open multiple files, each one opened is presented in a tab, as in a browser's tabs.
If I select four books in calibre and then use the View specific format option to view the PDF formats then that's what I get... each of the four books is opened in a separate tab in PDF-Xchange. They appear in the same left-to-right order as the books appear in the book list, with last one (right most) as the current tab.
So... it looks like your situation might be specific to OSX. How does Clearview present multiple open books... as artefacts on the desktop, or as tabs or similar within its own window.
Aside : be nice if a future version of the calibre ebook-viewer presented multiple open books as a separate tabs.
BR
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