The user interface for this app uses the following keys:

Home -> previous data item
End -> next data item
PgUp -> segment data line up
PgDn -> segment data line down
Arrow Up -> scroll up
Arrow Down -> scroll down
Arrow Left -> scroll left
Arrow Right -> scroll right
Alt+D -> delete item
Alt+N -> new item
Alt+O -> open file
Alt+X -> exit
Alt+S -> save file
BackSpace -> previous databox
Tab -> next databox
Enter -> refresh
"*" -> zoom in
"/" -> zoom out
"+" -> increase data
"-" -> decrease data
"1" -> big increase data
"0" -> big decrease data

(Note: extracted from the source files)