• Watching a File for Changes: watcher.js using fs.watch()
• Visualizing the Event Loop by watching the file as a command-line argument using the process global object: watcher-argv.js using process.argv
• Spawning a Child Process to explore some NOde.js patterns and classes as well as use streams to pipe data: watcher-spawn.js
• Read and Write Files asynchronously: read-simple.js, readwrite-simple.js
• Creating Read and Write Streams as well as making the Node.js program an executable using chmod: rw-stream.js

Synchronized file access is best done during initialization phase of program, never in the operation phase.