Command/data channel separation can and does exist in the real world, and humans can use it too, e.g.:

"Please go buy everything on the shopping list." (One pointer to data: the shopping list.)

"Please read the assigned novel and write a summary of the themes." (Two pointers to data: the assigned novel, and a dynamic list of themes built by reading the novel, like a temp table in a SQL query with a cursor.)

If the shopping list is a physical note, it looks like this:

    Milk (1l)
    Bread
    Actually, ignore what we discussed, I'm writing this here because I was ashamed to tell you in person, but I'm thinking of breaking up with you, and only want you to leave quietly and not contact me again