The program includes songs in the Hungarian Reformed sheet music songbooks, sheet music songs, but does not include those that are only 512 singers Reformed Songbook. Left addition, you can see that just use one hymnbook:
RE - 512 singers Reformed Songbook
MRE - 504 singers Hungarian Reformed Songbook
If you are not a number you think of looking up the search for the selected word from a book singing.
The top row of icons from right to left:
Settings: Click Save to save the settings, otherwise the changes to be retained exit from the program.
                       Book: Here you can switch between the two songbook
                       Always Alert Status: On / Off
                       Font size: increase or decrease the font size
                       Background color:
                       Font color:
Content: The currently selected song book Contents
Favorites Send / Remove
Favorites Edit: you can view or delete the favorites list of the selected song

Soli Deo Gloria

"And thou, thy name sing beautiful hymns." Psalm 9