System Testing Is end to end testing.
Here we check the behaviour of the module.
Eg:
suppose u r a cust "A".
u open the IE and type in mail.yahoo.com
and sign up.
and once finished u r now back in sign up page to enter ur 
account.
give ur login and password and click on sign in.
u should be able to enter.
click on inbox.click on the 1st mail.
click on compose.
send a mail to already created id "B"(eg:b@yahoo.com)
once u get msg sent response...click on sent items and 
check.
sign out
click on sign in to yahoo mail.
enter the login and password for B and sign in.
click inbox and check if u have rec a mail from A
click on reply and type sumthing and send it.
check in sent items folder and sign out.
sign in for A.
check if u have rec a mail from B.

This is system testing.

Black box testing  have two most important testing 
techniques
One is system testing and the another one is user 
acceptance testing
System testing is again branched into two more types.
1.Functional testing:also known as requirements 
testing.During this test,testing team validate correctness 
of every functionality in application build through below 
coverages.
1.behavioural coverages.
2.input domain coverages
3.calculations coverage
4.Error-handling coverage
5.backend coverage
6.service levels coverage
2.Non-functional:userinterface,usability,perfoemance(data 
volume,load,stress),scvalability and portability....it 
deals about the abo0ve mentioned testings.


System testing is more towards the end user usage of the 
system.......mail me if any doubts.

Testing the software before releasing it to the customer to 
identify the correctness, completeness and the quality of 
the developed software. The basic thing in system testing 
is that this testing is done with respect to customer 
requirements (i.e., by using the software like a customer).

testing the entire software with diffenent configuration 
and setup to verify that is it satisfy customer requiriments

sriharsh whatever the answer u are posted is correct

system testing is conducted on a complete ,integrated 
system to evaluate the system's compliance with its 
specified requirements.

it verifies software operation from the perspective of the 
end-user, with different configarations/setups

Once all the modules are integrated together. There 
different types of categories are doing the system testing. 
The over all idea of system testing is when u run on 
application it s perfectly working or not. This type of 
testing is conduct by the testing team.

To end to end testing

* System testing falls within the scope of black box 
testing,
* System testing is a more limiting type of testing
* it seeks to detect defects both within the inter-
assemblages and also within the system as a whole.

combine  all major level module and get system level module.
check the whole system based on software requirement 
specification.
it is done by tester
100% black box testing