Esc, [x] - close any popup window

ctrl-L - (Library, Home) - your local library

ctrl-R - re-reading of source texts of a current book

ctrl-Shift-R - reloading of application

ctrl-F, mouse over a word - full-text search

ctrl-V - verification of the number of paragraphs in the texts of this book

Shift-mouse over translation (Right pane) - change of translation

Alt-Left-Arrow - back in history

Alt-Right-Arrow - forward in history