A script consists of at least one public class with at least one public function. This one required function needs to be marked with the attribute  [Start].

The following example shows a very simple script.

public class VerySimpleScript
{
     [Start]
     public void MyFunction()
     {
           new Decider().Decide(EnumDecisionType.eOkDecision, "MyFunction was called!", "VerySimpleScript", EnumDecisionReturn.eOK, EnumDecisionReturn.eOK);
           return;
     }
}

 Public Class VerySimpleScript
   <Start> _
    Public Sub MyFunction()
      Dim dec As Decider = New Decider
      dec.Decide(EnumDecisionType.eOkDecision, "MyFunction was called!", "VerySimpleScript", EnumDecisionReturn.eOK, EnumDecisionReturn.eOK)
      Return
   End Sub 'MyFunction
 End Class 'VerySimpleScript

A script may contain more than one function. There even can be several classes in a script. However, there may only be exactly one function marked with the  [Start]  attribute!