Hello,

As a novice, I would like to know if someone can tell me
what the guidelines/best programming practices are on when
one should use a "Function" versus a "Subroutine".

It appears to me that both structures are completely
interchangeable. Is there any speed, memory overhead, or
other performance issues?

Perhaps someone can offer a short discussion, or point me
to web site? Thanks for the help in advance.