C#

Cursor old = Cursor.Current;
try
{
  Cursor.Current = Cursors.WaitCursor;
  // Do work.
}
// Optionally catch exceptions.
finally
{
  Cursor.Current = old;
  old.Dispose();
}

1. When a document is being read, any script that is in the document scope (not in a function or referenced in a handler) is run asynchronously to loading (basically, executed as it is read). This is commonly used for some initialization or write a string to the document in place of the script.
2. As an event handler. This is either by assigning a function to a handler, or specifying a function in an element event attribute (like onload, onclick, etc.).

public interface IFoo
{
  int Bar();
  string Name {get;}
}

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