DLL-Dynamic Link Library, a library linked to an executable program at run-time. It refers to a file with a .dll extension. A DLL is a set of functions that can be executed, or data that can be used by a Windows application. Several different programs reuse the same DLL instead of having that code in their own file, this dramatically reduces required storage space. DLL (Dynamic Link Library) files are basically "support" files for certain types of software. They are generally (but not always) found in your Windows System directory.
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What is an OCX file?
OCX is short of OLE Custom control, an independent program module that can be accessed by other programs in Windows environment. OCX controls end with an ".ocx" extension. OCX controls represent Microsoft's second generation of control architecture, the first were VBX controls written in Visual Basic.
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A driver (DRV) is a program that interacts with a particular device or special (frequently optional) kind of software. The driver contains the special knowledge of the device or special software interface that programs using the driver do not. Driver is often packaged as a dynamic link library (DLL) file with the extension ".dll".
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