By the operating table was a little table with various tools: scalpels, an unused IV drip, a bottle of whiskey ( half full, because optimism was something I really needed right now), a full syringe of morphine, and a bottle of something called "laudanum".
Today, memory is so plentiful that modern-day operating systems will use unused portions of main memory to store the core parts of programs that are used a lot (which is also called caching) so that when opening that program, it appears to load a lot faster.