The information comes from the technology file within your technology library (in IC5141). There are various single and two layer rules that can be specified. In IC61, it comes from the constraints system - which may be (say) net specific, design specific, or technology specific - there are quite a rich set of physical constraints that can be specified.
Since this information is in the technology data, it will be process specific.
Of course, it is not quite as comprehensive as what can be encoded in a rule deck for a physical verification tool - because you can do extremely complex checks in such a tool. But it will allow you to cover a large proportion of the rules (particularly in IC61).