`child_process` module.
It is possible to stream data through a child's `stdin`, `stdout`, and
-`stderr` in a fully non-blocking way.
+`stderr` in a fully non-blocking way. (Note that some programs use
+line-buffered I/O internally. That doesn't affect node.js but it means
+data you send to the child process is not immediately consumed.)
To create a child process use `require('child_process').spawn()` or
`require('child_process').fork()`. The semantics of each are slightly