Please refer the following link to get your answer:

http://www.knowledgeinbox.com/files/DP_in_QTP.doc

great link.
thanx.

very nice document

Thanks,
It is a great document.

It is a Very useful link for the Bigeners

Descriptive Programming:
Whenever QTP records any action on any object of an 
application, it adds some description on how to recognize 
that object to a repository of objects called object 
repository. QTP cannot take action on an object until 
unless its object description is in the Object Repository. 
But descriptive programming provides a way to perform 
action on objects which are not in Object repository

link doesnt work anymore.....

thanx for sharing ur knowledge

thanx for giving these nice information.

Its very very useful link.A million thanx for u

mercy the link u provided is no more working.
so kindly try to reach out with some alternative.

Mercy !Great link
Than you verymuch

Hi ..plz can Anyone provide me the Link..

Without giving the object information into the object 
repository
we can directly execute the test scripts by using DP.By 
considering 
following condition we will come to know how useful DP is.

1. When objects are dynamic in nature, they require special 
handling
 to identify the object, to handle this type of objects we 
use 
 descriptive programming.The best example would be to click 
on the 
 link which changes according to the user of the 
application.
2. When Object Repository is getting huge in size, due to 
adding No.of
 objects into it, the performance of QTP will be decreased.
3. When you dont want to use the object repository at all, 
then the 
 first question will be why not object repository. 
considering some
 scenarios we can understand the importance of DP.

Scenario 1. When we are having an application, which is not 
yet been
 developed, or in the state of run, QTP requires the 
application to be
up to record the object properties to identify an object. 
waiting for
the application to be up will be the waste of time, and if 
we know the
flow of the application, then we can start writing DP.

Scenario 2. If we having an application, with 3 text 
buttons each in
a page, adding all this 3 objects into the object 
repository, in the 
flow of 10 pages, a total 30 objects will be added into the 
repository,
which is not a good practice, by writing 3 descriptions for 
the objects
we can add them to the repository.

4. Modification for test script is required, but the 
repository for the
same will be in the state of "readonly" or in "shared 
mode", so modification
will impact other scripts as well.
5. When we are performing similar type of action on 
objects,i.e, when
we are having an application with 20 text buttons, adding 
all this
objects will not be a good practice.