You can "store" an instance in a variable by storing its unique ID (UID) in a number variable. To get it back, you just use a 'pick by UID'.
You can also reference an object type simply by storing its name string in a text variable, but I'm not clear what you would want to do with that.
Similar techniques work in Classic. It's an interesting idea, but I'm not clear what it would allow you to do that you can't do with the above. How exactly will it work with the SOL/picking algorithms?