Data Driven Test Means we can test application with 
multiple test data.  there are 3 types of ddt.

1. Dynamic Data Submission
2. Data Table
3. From Front Grids

1. Dynamic Data Submission:  Here ur interaction is there 
at the time of test execution. u follow below steps

un = inputbox("Enter the user name")

here un is variable to store the user name

u can give the variable where u want to insert

(i.e., window("login").winedit("user name").set un)


2. Data Table:  We can send data from excel sheet here ur 
interaction is not here.

u must take the value from data table.  u follow below 
navigation.

Navigation:  Goto KeyWord View
where u want parameterize u Select Value column of that 
object 
press right corner of that select column it will shows 
value properties dialog box here u can select Parameter 
option and take Datatable option and select required 
parameter.
(i.e., window("login").winedit("user name").set datatable
("username","dtGlobalSheet"))