Environment Variables enables you to use the variable 
values from other sources during the run session.
the variable values can be specified by the users or QTP 
can specify depending upon the conditions and options u 
choose.

Environment variable means we can use any action if any 
test.

they are variables that you can change according to your
necessities related to what kind of utilities you want to
run on your system  then give the location where the system
will follows to find it,if not satisfied write back your
question again

Hai Sriram,

       Environment variable means, when we define these 
variables we can call these variables in within the text
out side of the text,in QTP once we define the variable 
againg we can't reuse those variable, but Enviroment 
variable we can use as our require ment.
 
these variable may define into 3 ways
i) user define internall
ii) External
iii) Built in 

 user define internall mean we can call these variables 
with in the text.
 
 External variales means we can call within the text and 
out side of the text, we can do modifcation also means we 
rename it.

 built in variable means we can call internall and external 
purpose but we can't do any modification, readonly purpose.


 i think u got it.

bye ......Sekhar(sekharbirada@gmail.com)

these variables are using in automation scripts which are 
to be executed in different environments, so that these 
variables are called as environment variable.

as testing part we neet to execute the test scripts in 
different environments like unit, system, alpha, production 
testings.  where the information of all these environment 
is different. so we use these variables to store the 
information to execute the script successfully in different 
environments.

Environment Variables are Global variables which scope 
doesn't changes throughtout test execution,regardless of 
the number of iterations,unless you change the values of 
the variable programatically in your script.It use variable 
values from other sources during the run session.These may 
be values you supply or values that Quick Test generates 
for you based on conditions and options you choose.
There are three types of Environment Variables.
1.Built-in
2.User-Defined Internal
3.Used-Defined External

ev are two types
Built in  variable  these are predefined helps to know
inbuilt properties like operating system ,hostname,server etc


userdrfined: this helps to send data externally to the QTP

EV are related to un & Pwd & URL of the application under
test.We can write this in the notepad and save in EV folder
 with .ini extension in the Frame Work.(NOTE:-we have to
use[]to write EV)

When Ever Required using below code we can load this in the
script.
-----------CODE--------
environment.loadfromfile "path.ini" 

Any doubts---------mail to-----mskalyan.smile@gmail.com

by using environment variables we can avoid the hard coded 
values in script. and we can pass single value in the 
script. they are 2 types
1. bultin
2.external/internal
 in real time we can use external environment variables only