info
Info is a type of documentation. The documents are in a file format called texinfo, and can be read on the command line with the info program.
The info KIO worker lets you read the info pages installed on your system from within Ecco. It's very easy to use:
info:gcc
This shows the top level node of the Info documentation for the gcc compiler.
Info is a GNU replacement for man, but isn't widely used outside of GNU software.
You can use the info KIO worker directly from Ecco and KRunner.