Hi,

In Decriptive programming all the properties and their 
values which make an object uniquely identifiable are 
written in the script.

Regular Expressions can be used to specify the value.

Easy way to learn Descriptive programming would be 
1.Record the script
2. Now modify the code in such a way the code becomes 
independent of object repository
3.Now try to run this code

Eg. 
1.If the recored statement is 
Browser("Yahoo Login").Page("yahoo Login").WebEdit
("Login").set "User1"

2. Now try to identify the variable-value pair for each oh 
these objects which will make these objects unique.
For example if for 'Page' object , its title makes it 
unique, then specify the property-value pair in the 
description

Browser("title:=Yahoo Login").Page("title:=Yahoo 
Login").WebEdit("Name:=Login","html tag:=INPUT").set "User1"

Note: 
1. Object Spy will give the the list of all the properties  
and their current value for an object. 
2. what i do is, 
  I. i record the script, now the object  repository is 
created.
  II. Now i start changing the script, by looking at the 
object repository i change the description of the object in 
the script. 
   III. Run the modified script. I correct the script until 
the scrit runs successfully.
   IV. When the script runs without any error and is 
completely descriptive. Go to Object Repositry and delete 
the antire object repository
3.You can write partly descriptive script also
E.g. 
Browser("Yahoo Login").Page("yahoo Login").WebEdit
("Name:=Login","html tag:=INPUT").set "User1"