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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.
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).
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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.
If the browser encountered a page specifying an ActiveX control via an OBJECT tag (the OBJECT tag was added to the HTML 3.2 specification by Charlie Kindel, the Microsoft representative to the W3C at the time [8]) it would automatically download and install the control with little or no user intervention. This made the web "richer" but provoked ...
Improper error-handling in an application program can lead to a scenario where a file is locked (either using "share" access or with byte-range file locking) and cannot be accessed by other applications. If so, the user may be able to restore file access by manually terminating the malfunctioning program.
Code injection is a computer security exploit where a program fails to correctly process external data, such as user input, causing it to interpret the data as executable commands.
A DLL file often has file extension.dll, but can have any file extension. Developers can choose to use a file extension that describes the content of the file such as .ocx for ActiveX controls and .drv for a legacy (16-bit) device driver. A DLL that contains only resources can be called a resource DLL.