How to Define a Property
To specify certain types of interaction between windows, you need to define properties. To rename a user-defined property, remove it and then re-define it.
To define a property:
The New Property dialog is displayed.
The argument position is a number, e.g., 1, 2, ... If it is 1, then the first parameter passed in calls to the object will be assigned to the property as its (new) value, and so on.
The new property now appears in the properties list. You can refer to it by selecting it and then clicking Set. In calls to the object, you can (re)set its value by passing the value as a parameter.