Some softwares not require GUI (Front End)
These softwrae are called as Middlewares or Engines.
These engines or back end software will be linked to some 
front end applications.
These back end software typically process the input 
paramaters and generates output(XML form).
To test like this softwares we have to prepare some 
interface using HTML forms to post the paramaters for 
processing.

For example:
A online shopping site offers different types of products 
for sale,
When we click on 'Buy' button the online shopping site will 
send customer paramaters to billing engine for processing 
transaction.So here the Online shopping portel just 
provides a front end and passes the user data to other 
billing engine.This data is:
Product ID selected by the user,
Prouct Price,
Time of transaction,
His Credit card Number..etc.
So billing engine processes the transaction and returns the 
transaction status to shopping portal.
ok
byee
Rajendra Prasad Reddy
rajendra_penumalli@yahoo.com