What are some ways to invoke the operating system commands? Are there
any ways such as ("dir","cls", or any other valid system command?)
Would I need to create a .dll file, or is there a proper way to use
the Runtime.getRuntime().exec()? I have Windows XP operating system
on my computer. A lot of destined programmers wanted to know how to
invoke the operating system commands. If the developers of Java have
already include it in the library, then why a lot of would-be
programmers have difficulty?

I wish someone could explain more about it in detail? If it is
possible, what are some ways to invoke the operating systems commands
in Java?