This talk will take you through the basics of a11y in a desktop application, using LibreOffice as an example. Starting with basic terminology (mnemonic widget? accessible label?), we'll discover building blocks of a11y in desktop environment, have a look at the sources of most common mistakes developers make when they don't include a11y-awareness into their development process and how to fix them. We'll also show the ways how anyone (even those with little or no knowledge of programming) can contribute to improving a11y ... not only in LibreOffice.