Order of evaluation/ namespaces in CL

Is there a concept of namespace in CL.
e,g if I copy one activity into another slide, how is the CL code from one slide distinguished from other?

can I evaluate variables across slides? e.g to sum up points earned across activities?

Also how does one think about fragments of CL code between different boxes in an activity? what order these variables evaluated?

You can access variables from other slides if the component has a unique name. If component names are reused, I believe it defaults to the current slide, or you get a warning if duplicate names are on other slides.