QTP can be used with Keyword View(u do not need to program 
the automation script, thru Record/playback code gets 
generated automatically) and Expert View (automation code 
is manually scripted). Though "Data Driven" testing is 
possible thru both the views, data driven framework is 
mainly concerned with Expert view. For example, for the 
fields that u want to parameterize, we store the respective 
field values(data) in a data table such that for the each 
iteration u run, data is driven from the data table.using 
the object model reference ur code in expert view can be 
further enhanced.For ex: for the client server flight 
example, try different wrong logins(by parameterizing)using 
function concept and capture the recovery scenarios and 
automate the login such that after 2 or more failures user 
successfully logins.