Than you khann for your help, but I think that is not the issue here.
The problem is that command "OPENDCL" does not load the arx, executable or whatever the file is, that loads all the programs' commands and obviously nothing works.
I have also installed the runtime but still does not work.
There must be a simple reason for that so I keep waiting for the simple answer.
I guess it is part of the learning process...
Thanks anyway.