[Solved] What is Debug Channel?

Generally, googling your question before posting it here is recommended. I’ve found a potential resource for you here:

http://libcwd.sourceforge.net/reference-manual/group__group__debug__channels.html
And here:
http://libcwd.sourceforge.net/tutorial/tut2.html

I’m not a C++ specialist but those seem to be the answer you’re looking for.