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How do I write functions which have a global scope
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Each function defined in the server or client module of an item becomes an 
attribute of the item.

Thus, using the 
:doc:`task tree </programming/task_tree>`,
you can access any function declared in the client or server module in any 
project module.

For example, if we have a function ``some_func`` declared in the Customers client 
module, we can execute it in any module of the project. 
Note that the task is a global variable on the client.

.. code-block:: js

  task.customers.some_func()

On the server, the task is not global, but an item that triggered / called it is 
passed to each event handler and function called by the 
:doc:`server </refs/client/abstr_item/m_server>`
method. Therefore, if the ``some_func`` function is declared in the Customers 
server module, it can be executed in a function or event handler as follows:

.. code-block:: js

  def on_apply(item, delta, params): 
    item.task.customers.some_func()


Note that event handlers are just functions and can also be called from other 
modules.