How do you assign a global var in a CAS function?

[webmasterpdx]

My goal was just figuring out when variables are cas vars vs home vars. e.g. just assigning a var in a cas program (that isn't declared as local) will make it global, and if assigned in a cas program, it will be a cas variable. If it's a list for example, you'll need to use [] to index it instead of (). i.e. It makes a difference if it's a cas vs a home variable, even if the same type.