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https://git.taler.net/gnunet/messenger-gtk/file/src/ui/invite_contact.c.html invite_contact.c - messenger-gtk - Gtk+3 graphical user interfaces for GNUnet Messenger graphical user interfacesinvitemessengergtkgnunet https://www.fit.vut.cz/study/course/280899/.en Graphical User Interfaces in X Window System - GUX graphical user interfacesx window systemgux https://git.taler.net/gnunet/messenger-gtk/file/src/file.c.html file.c - messenger-gtk - Gtk+3 graphical user interfaces for GNUnet Messenger graphical user interfacesfilemessengergtkgnunet