before doing any actions through the script, we should 
check that control exist and the required property is ON.

For example, if you want to click a button in a page, we 
should make sure that button exists( some time that screen 
may not be active) and it is in 'enable' state. By 
verifying this our test cases will run with out any error. 
If a am wrong, can any one help in this??    

if it is wrong just forgive me
   

    at heavy loads some times server throws wrong messages 
so that we have to check its functionalities at heavy loads 
so we are adding verification checks (like functional
ceckpoints)inour scripts

some body pls provide reevant answer,which would fit the 
question.

Verification checks is to make sure whether the texts or 
images recored are as per the client acceptables or not.
For example:
If you open an HDFC bank(say) you can able see text 
as"Welcome to HDFC bank".At the time of development if this 
text is coded as "welcome to hdfc bank"(say) which is not 
acceptable as per the requirement .So inorder to check the 
completeness and corrections of the application we will 
added verfication checks.
In Load runner we have two verfication check points
i.Text check point
The functions used under text check point are
web_find
web_red_find
web_global_verfication

ii.Image check point
The function used for Image check point is
web_check _image

Please revert back to me if i am wrong
Maheshwar
maheshwar_sonu@yahoo.co.in
mobile:+91 9884746314

Maheswar ur answer is absolutely correct

Well Said Mahesh!!But let me know are we using this 
web_check _image exensively for your Projects i meen is 
this used for html / Url Recordnig moreover URL provides 
the subsequent features required for image check is this 
essential, please let me know more about this approach.

Thanks

Under heavy load, the application might not be serving the
desired pages. If there are not verification checks, the
transaction will still PASS without allowing us to get an
idea into the application problem. For e.g., if an
application serves a different page or error that doesn't
fall under the regular HTTP error codes, we might miss it
without any verification checks.

When I was working with one of the HTTP based application, I
observed the transactions getting passed in the controller
while failing with manual user. 
After analysis, I found that the application serves a simple
HTML page with the message "exception found". LR didn't
report any error since from its perspective it is a valid
HTTP 200 response. Adding a verification check helps you to
uncover these kind of RUN TIME errors

Hi,

I'm trying to measure page load times in a web app.  How do 
I verify that the page I go to next is fully loaded?  Do I 
use content verification (web_reg_find)?  I am measure the 
time it takes for a page to load and then the user goes to 
another page and another and so on.  I need to know how 
long it took for page one.  How long it took for page two 
and so one.  I'm using transactions for each page, but I 
want to make SURE that the page is fully resolved/loaded 
before the scenario goes to the next page.  So, does 
LoadRunner automatically do this or do I have to use 
content verification or do I do it in some other way?

Thanks,
Brian

Hi Brian,
I am exactly looking for the same requirement.As far i 
know..LR wont do it automatically but we need to add some 
conditional loops for checking the all the images are 
loaded completely.

I will soon let you know the way we write loops for this 
kind of requirement.

Thanks
Murali