Conditional Processing in Login Script

In the NT 4.0 help for the IF statement, MS indicates that it is possible in a batch statement to determine whether a user typed a Y or N and use a goto statement to direct the processing to a paragraph based upon the errorlevel generated. However, I don’t understand how to implement this in a login script. Can someone explain this more clearly than the documentation, including a short example? Or does someone know of another way to do what I want to do? Thanks.