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Before Windows 2000, Windows was vulnerable to this because the COM class table was shared across all users and processes.Only one COM object in one DLL/EXE could be declared as having a specific global COM Class ID on a system.By placing this code in a DLL, all the applications on the system can use it without using more memory.This contrasts with static libraries, which are functionally similar but copy the code directly into the application.If any program needed to create an instance of that class, it got whatever was the current centrally registered implementation.
Solutions to these problems were known even while Microsoft was writing the DLL system. Windows has been particularly vulnerable to this because of its emphasis on dynamic linking of C libraries and Object Linking and Embedding (OLE) objects.
DLL incompatibility has been caused by: 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.
Application installers were expected to be good citizens and verify DLL version information before overwriting the existing system DLLs.
DLL Hell is the Windows ecosystem-specific form of the general concept dependency hell.
DLLs are Microsoft's implementation of shared libraries.