IO - documentation - question

both IO::Handle and IO::File are included in core package called IO. They are object interface for perl I/O subsystem. If you use IO::Handle/IO::File in any scri开发者_运维知识库pt, open will also return objects of this class.

(bvr's comment from DBI::ProxyServer: Problem with writing a log-file)

Is there a good place in the documentation where I can read about this?

I would recommend to start with IO::Handle, then look at pages referenced in SEE ALSO section.