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UnregisterClass()
Remove a Windows window class and free its resources
------------------------------------------------------------------------------

Syntax
UnregisterClass( <cClass>, <hInst> )   -->   lSuccess

Arguments
<cClass> is a character string giving the name of the class to
be removed.

<hInst> is the handle of the instance of the application.  (As
returned by the _GetInstance() function.)

Returns
If successful, logical TRUE (.T.) is returned, otherwise FALSE
(.F.) is returned.

Description
This function removes a window class from Windows, freeing up
its resources.

An application must not call this function if there are any
existing windows of the class.

Example
hInst = _GetInstance()
if  !UnregisterClass( "MyApp", hInst )
     // failed
     quit
endif