How to define the unused devices 3-9 in DOS redirection - China DOS Union Forum

We know:
-------------------------------------------------------
Handle Numeric handle code Description
STDIN 0 Keyboard input
STDOUT 1 Output to the command prompt window
STDERR 2 Error output to the command prompt window
UNDEFINED 3-9 These handles are defined separately by applications and specific tools.
-------------------------------------------------------

What I want to ask is, how are 3-9 defined in specific tools, are there any examples?
Any code snippets in c, c++, java, perl, python, etc. are fine...

Floor1　sinbao	Posted 2007-10-29 22:22
初级用户　Posts 73　Credits 184
We know: ------------------------------------------------------- Handle Numeric handle code Description STDIN 0 Keyboard input STDOUT 1 Output to the command prompt window STDERR 2 Error output to the command prompt window UNDEFINED 3-9 These handles are defined separately by applications and specific tools. ------------------------------------------------------- What I want to ask is, how are 3-9 defined in specific tools, are there any examples? Any code snippets in c, c++, java, perl, python, etc. are fine...