What are SetToProperty, SetRoProperty, GetToProperty scripting?

What are SetToProperty, SetRoProperty, GetToProperty scripting?
What is the difference between version 6.5 and 8.2?

SetToProperty, SetRoProperty, GetToProperty scripting?

Objects will have the below 3 properties

OR- Object Repository

SetToProperty -Setting the Testobject property almost like modifying the property values which are captured while recording or adding objects.But the property values set will not be reflected in OR.will be reflected while execution of script only.

GetToProperty- Getting the values of test objects stored in OR

GetRoProperty-Getting the Runtime property of an test object .i.e the latest value holded in th object @ runtime.