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DLL hell was a very common phenomenon on pre-Windows NT versions of Microsoft operating systems, the primary cause being that the 16-bit operating systems did not restrict processes to their own memory space, thereby not allowing them to load their own version of a shared module that they were compatible with.
The file format of a DLL is the same as for an executable (a.k.a. EXE), but different versions of Windows use different formats. 32-bit and 64-bit Windows versions use Portable Executable (PE), and 16-bit Windows versions use New Executable (NE).
Dynamic-link library, or DLL, is Microsoft's implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems.These libraries usually have the file extension DLL, OCX (for libraries containing ActiveX controls), or DRV (for legacy system drivers).
ActiveX Document is a Microsoft technology that allows users to view and edit Microsoft Word, Excel, and PDF documents inside web browsers. Active Messaging, later renamed Collaboration Data Objects; Active Server Pages (ASP) ActiveMovie, later renamed DirectShow; ActiveX Data Objects (ADO)
Dynamic loading is a mechanism by which a computer program can, at run time, load a library (or other binary) into memory, retrieve the addresses of functions and variables contained in the library, execute those functions or access those variables, and unload the library from memory.
These normally have reliable and non-conflicting addresses. So the copied DLL can use any kernel32.dll calls, f.e. to load another DLL with full advantages of a locally loaded DLL, i.e. having all relative library-dependencies. The path to that DLL is copied to the foreign address space and given as a void-parameter to the thread-function.
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In computing, Dynamic Data Exchange (DDE) is a technology for interprocess communication used in early versions of Microsoft Windows and OS/2.DDE allows programs to manipulate objects provided by other programs, and respond to user actions affecting those objects.