KCL can be implemented outside of KAREL. You can build several lines of KCL code in a text editor and deploy as a .CM file for setting up common system variables, but you won't be able to set up as much stuff as you can with a KAREL file. For instance, you can't label your IO with KCL but you can with KAREL. You can run programs with KCL or KAREL from a Telnet session, or from a web browser though.
KCL will let you write I/O and simulate ports, but you cannot read them, or I am not seeing how to do it. You also can't read or write to registers from what I have seen so far.
It's kind of silly, but there might be some utility in there in some situations. I haven't got to play with it a whole lot.
KCL ABORT FORCE can be very useful. 😉
