hi..............

ST :
Smoke testing is non-exhaustive software testing, 
ascertaining that the most crucial functions of a program 
work, but not bothering with finer details. The term comes 
to software testing from a similarly basic type of hardware 
testing.

UIT :
I did a bit or R n D on this .... some say its nothin but 
Usability testing.
Testing to determine the ease with which a user can learn 
to operate, input, and interpret outputs of a system or 
component.
Plz lemme knw other defns.

Smoke tesing is nothing but to check whether basic 
functionality of the build is stable or not?
i.e if it possess 70% of the functionality we say build is 
stable.
User interface testing: We check all the fields whether 
they are existing or not as per the format
we check speelling
graphic
font sizes
everything in the window present or not|

smoke testing is the term we can use for the application 
build is stable or not while in this testing we will check 
the s/w is providing correct navigations or not


where as user interface testing is one type of testing in 
usability testing

the micro soft has given some rules for this testing
1. user name must initial letter  caps.
2.controls dont overlapeed.
3.every window must have ok and cancel exisitence.
4.control must have the right alignment.
5.system menu exisitence.