Where the initial expression in a conditional block proves False, ElseIf allows for the testing of another expression, executing an alternative section of code should that expression prove True.
If expression [Then]
Elseif expression [Then]
Where the initial expression in a conditional block proves False, Elseif (or, optionally, Else If) marks the beginning of an alternative program execution path, whereby the statements following will be executed, but only where the Elseif expression is True.
' Simple If check with alternative program flow dependent on a positive Elseif test:
"a equals one"
"a equals zero"