here the stress test doesn't exactly the same machine the
server side by using the card(atm) for more no of times than
its exact load.
for one atm machine then try to transact more cards at a time .
more no of transactions by the machine in a given period of
time to check what is its max capacity of work load accepted
by the system.

try to transact by n no of cards for transaction in day
without giving time interval.
these are some of the stress related things for an atm machine

Very nice answer.....
i just thought of addin 1 more point.
during a transaction there are button in the machine, try 
multiple keys during another prosess.
e.g. u pressed for mini statement and wen the statement is 
being prosessed, press enter button or clear button.
I hope i was clear.

good saurab but here we are testing on the stress i.e more
than its load at what point the system is not responding for
the request processed by a customer on an atm is stress. u r
description can be used for the test cases of functionality
but not the stress
with regards
jagadish (jagadishk.9454@gmail.com)

Jagdish,
I agree both of you. You both are right as it is a stress 
test can be performed for  a single functionality/multiple 
functionality at a given point of time.

I wanted to thank you as soon I got your response, but i 
wanted to wait for few more responses.

Thanks for Saurab too, giving one more direction of testing.

regards
-Vinod Ghate

venkat,
i agree above all the answers are some what releavent to 
the question.
we wanted to check weather the ATM bank is response to the 
behiond mini statement to all the entered ATM card from the 
customer.

thanks for your valuable answers