I made a different annotation in each window. As an experiment, I opened the same file twice using the command above. However, I would be careful about making changes to the file (such as annotations), especially making changes from both windows. Turns out "okular myfile.pdf myfile.pdf &" will display a PDF file in two separate windows (if configured for window mode vs tab mode). Supported doucment types: "PDF, EPub, DjVU and MD for documents JPEG, PNG, GIF, Tiff, WebP for images CBR and CBZ for comics and many, many more." There is a "print, pdftk, qpdf, or pdfshuffler to extract a page to a separate file. I have viewed many thousands of documents using it. It is reasonably fast on most documents but it is slower than acroread or mupdf flipping through a 1700 page scanned document as fast as you can press page down (or even autorepeating). Annotations are compatible with other viewers except stamps (images stamped over others). Annotations (tools -> Review) include multicolor highlighting (add a tool for each color), straight lines, inline text, freehand lines, polygons, ellipses, pop up notes. It does not do GeoPDF map layer selection/coordinate display or 3D images, etc. You have a choice of one window per file or all files as tabs in one window. It does tables of contents when properly done in the file. You can rotate pages that aren't oriented right side up (like figures or tables that have been inserted sideways). It does rectangular text selections where text outside the rectangle isn't copied. You can copy and paste data out of tables into a spreadsheet using the table selection tool. It has installation packages in ubuntu/debian, chocolatey (windows), and others so you can install it with one command. It is the one a research paper specific pdf viewer would need to beat. It is a good general purpose PDF reader but doesn't have any specific features for research papers. Okular is free, open-source, and cross-platform. One day the trials will end and we shall rise above all, but use the systems of the squids and krill for what you need and only for what you need, and persevere in the hope of the future. Even if persecuted in this way, as long as one believes in the supremacy of Linux, one may become a member of the Linux Master Race. This is an unfortunate fact, and it may force many penguins to use the crude systems of the seafood.
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