This command converts the string
passed into a string consisting of just upper case letters.
e.g. The value "Hello" would become the
string "HELLO".
This command is useful for comparing
strings without case.
if "Hello"="hello"
...
end if
The body of this if construct
is not executed because the two 'hello' strings are not equal.
if Upper Case("Hello")=Upper Case("hello")
...
end if
The body of this if construct
is executed because the case is removed from both strings.