TO test the funcunality with multifulm tst data(input) we 
will create parameters

THE SIMPLE USE IS TO HOLD A VALUE THAT IS OBTAINED IN A 
PROCESS OR TASK TEMPORARLY AND USE THE VALUE IN THE NEXT 
ACTIONS OR PROCESSES

1.Right click on a value we want to parameterize (in our 
case this is a username - "load1") and select "Replace with 
a parameter" menuitem

2.Name the new parameter as "UserName" and click OK btn

3.the value "load1" will be changed with a UserName 
parameter

4.Right click on the just added parameter and 
select "Parameter properties"
5.By the way, this menu allows others operations with 
parameters. You can:

"Restore original value (load1)"
In other words, rollback your changes
"Replace more occurrences" This menuitem will find for the 
initial string ("load1") in the script and will propose to 
replace it with the new parameter ({UserName}).

Tips: Please, use this feature carefully. For example, 
let's there is "http://server/load1.htm" link in the 
script. Here, "load1.htm" is a name of page, but 
user. "Replace All" will produce incorrect link -
 "http://server/{UserName}.

6.Parameter properties" will be shown.This dialog is 
a "heart" of any parameter. You can here:

specify the type of the parameter 
create the pool of values for any parameter (add new values 
for any parameter)
specify, how the parameter will be changed against 
interations and users
and other different settings...



7.After that perform the similar procedure for "Password" 
parameter

8.Parameterizing allows simplify load/performance testing:

Instead of writing a separate LoadRunner VuGen script for 
each virtual user, we added parameters for specific 
information (username & password) and used the one script 
for all users.
Parameterizing allows decrease maintenance cost. If 
application under test is changed, one test should be 
updated for 100 (e.g.) users, but 100 tests for each user
Supporting of tests is a real pleasure :) To add new user, 
a test has to update dat-files only.

Parameterization is the process of sending different values
to different Vusers..