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OCX is a acromyn that stands for Object Linking and Embedding (OLE) Control Extension.  A OCX is a custom computer control that is created for use by applications running on Microsoft's Windows systems. OCXs provide such functions as handling scroll bar movement and window resizing.  OCX controls end with a .ocx extension.  If you have a Microsoft Windows system, you'll find a number of files in your Windows directory with the OCX file name suffix.