There are 3 types of ordinal identifiers available in qtp. 
They are: 
1) Location : qtp will create sequence of numbers from 0, 
1, 2, 3…. Based on the objects located on the application 
or aut. 

2) Index : qtp will create sequence of numbers from 0, 1, 
2, 3…. Based on the code implemented or developed for the 
objects. 

3) Creation Time  :qtp will create sequence of numbers from 
0, 1, 2, 3…. Based on the loading time of the web pages

If both the mandatory properties and assistive properties 
are fails to identify uniquely, QTP uses ordinal property 
(Index and location) to the description to recognize the 
object uniquely. 

Types of ordinal identifiers to identify an object are
i)	Index
ii)	Location
iii)	Creation Time
an example of ordinal identifier:
 
Suppose there are 2 “Back” button link(i.e back to the 
previous page)in a web page. Hence these two will be differ 
from each other by their “Location”.