The document discusses using Qt instead of SWT for styling and cross-platform support in Eclipse RCP applications. It notes that styling is important, and the E4 CSS effort led them to investigate using a new SWT platform based on Qt for Windows to address licensing issues with Qt. It demonstrates applying CSS styling to Qt widgets, though notes Qt is not truly native on all platforms like other toolkits. Riena was developed using QtJambi instead of directly using Qt.