An ObjectHandle is a unique (within a control instance) 32-bit ordinal assigned to each instance of each page. This is equivalent to a Long Integer in most development environments.
Normally, only one copy of a page is maintained in Webster for each URL, and so there is usually a one-to-one correspondence between the URL and the ObjectHandle associated with each cached page. However, when a FRAMESET page is visible, it may have multiple FRAME sections displaying content from the same source URL. In this case, the several instances of the page for that URL are each assigned a different ObjectHandle so that they can be uniquely identified.
The ObjectHandle of the current UI focus page is available in the FocusPageObjectHandle property and the FocusPageChange event provides notification that a new page has UI focus.