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The PDF options panel controls how Regina handles PDF packets.
There are two ways of viewing PDF packets in Regina. The first is to use KDE's embedded viewer, which will display the PDF directly within Regina's main window (as illustrated below). This requires you to have Okular installed (the PDF viewer that ships with KDE).
The second way is to use an external PDF viewer: this can be any program that displays PDF files, such as Xpdf under GNU/Linux, or Preview under MacOS X (which is illustrated below).
The PDF options panel lets you choose between these two methods and fine-tune them:
The settings here are:
If checked, Regina will search for an embedded viewer that it can use (but if it cannot find one, it will fall back to an external viewer instead). If unchecked, Regina will always use an external viewer.
Specifies the command that starts your external PDF viewer, such as “evince” or “xpdf” under GNU/Linux, or “open” under MacOS X. Regina<