After that you should continue to keep it on a bookshelf in your office. Twenty years ago, batch programming was mainstream and real time was just a niche. Today, interactive programming is mainstream. Batch processing was read, process, write. Early interactive programs were question, answer, process.
Any interactive program has real-time aspects.
For example, try typing on a system that has slow and variable echoing of text to the screen. Your error rate will skyrocket, probably to the point of uselessness. The difference between two single mouse clicks and a double click is also a real-time issue. Real-Time UML , Second Edition is about more than just notation. It also covers the analysis and design processes.