end to end testing is nothing but system testing..testing 
the application starting from scratch to the end after 
integrated all the modules.....

end to end testing or inter systm testing :
  example :  E-seva

end to end testing is nothing but inter system tesing.if 
our application should share the data with other similar 
applications ,testing whether it is coordinating properly 
with other applications is called end to end testing
ex-E-seva

end to end testing is nothing but inter system 
testing.during this testing testing engineers  validates 
whether our app. build is co-existence with other software 
systems or not with share their common resource.