The following identifiers are reserved by Hollywood and cannot be used as variable or function names:
And Block Break Case Const Continue Default Dim DimStr Do Else ElseIf EndBlock EndFunction EndIf EndSwitch FallThrough False For Forever Function Global Gosub Goto If In Label Local Next Nil Not Or Repeat Return Step Switch Then To True Until Wend While Xor
If you attempt to use one of those as a function or variable name, you will get an error from Hollywood.