Syntax: @check-property <object>.<propname>
@check-chparent <object> to <newparent>
You cannot add a new property to an object if an ancestor or a descendant already defines a property with the same name. @check-property will give you the list of all descendants of <object> that that define .<propname>.
Likewise you cannot chparent an object to a new parent if the new parent has a property that is also defined on the object or some descendant. Use @check-chparent to find out all instances of conflicting properties that would interfere with @chparent in this manner.
Note that @check-property requires either that you own the object or that it be writeable, the same conditions that need to hold if you are to create new properties on the object. Similarly, @check-chparent requires that you own the object and that the new parent is either fertile or likewise owned by you.
For objects with large numbers of descendants, these commands can be time-consuming.