> Just followed the habits, e.g., nmake.exe also can run built-in
> commands such as echo, dir and so on.


As a note, if it's of any usefulness, java doesn't support built-in
commands via system:

java.io.IOException: java.io.IOException: Cannot run program "cd ":
java.io.IOException: error=2, No such file or directory

:)
-=r