# Using the dispatcher service function reference

This section provides an alphabetically ordered reference to the Natural Access dispatcher functions. A prototype of each function is shown with the function description and details of all arguments and return values. A typical function description includes:

Prototype | The prototype is shown followed by a listing of the function's arguments. NMS Communications data types include: WORD16-bit unsigned DWORD32-bit unsigned INT1616-bit signed INT3232-bit signed BYTE8-bit unsigned If a function argument is a data structure, the complete data structure is defined.
Return values | The return value for a function is either SUCCESS or an error code. For asynchronous functions, a return value of SUCCESS indicates the function was initiated; subsequent events indicate the status of the operation.
Events | If events are listed, the function is asynchronous and is complete when the DONE event is returned. If there are no events listed, the function is synchronous. Additional information such as reason codes and return values may be provided in the value field of the event.