its written alongside the short-cut key for e.g. Alt + G for changing the language, Alt + P for printing.
Apr 23 2014 09:34 PM
some horizontal bar buttons are active in some screens and some aren't.
the best thing to do is to click on each button and explore for yourself. you will get to see all the options each button gives and what it means. also go through the Tally ERP 9 Reference Manual on this topic.