Exclamation Marks

I've recently encountered this type of code:

Code:

---

Me!Something = MyVar
'or...
rsADO!FieldName = TheValueOfTheField

---

What do these exclamation marks mean and how do I use them?
Are they equivalent to periods (.)?

Having done some checking...it's only for databases. Pity really, because it could be quite useful.

Ok, thanks. :)