the guru-test: analyze code

[kedaman]

This code in a public classmodule:

Friend Static Function Useoffset&(Optional offset& = -1)
Static temp&
    Useoffset = temp
    If offset >= 0 Then temp = offset Else temp = 0
End Function

tell me where this could be usefull. If you guess correctly what i'm using it for (and note i can't find another better way to do than this) 10 points, find another usage for it 6 points and bonus 5 points if you find a better way to do it.
Note every single keyword has to have it's purpose.