First you should know what the
dll is.
Quote:
A dynamic-link library (DLL) is an executable file that acts as a shared library of functions and resources. Dynamic linking enables an executable to call functions or use resources stored in a separate file. These functions and resources can be compiled and deployed separately from the executables that use them. The operating system can load the DLL into the executable's memory space when the executable is loaded, or on demand at runtime. DLLs also make it easy to share functions and resources across executables. Multiple applications can access the contents of a single copy of a DLL in memory at the same time.
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And
the use of dll is :
Multiple processes that load the same DLL at the same base address share a single copy of the DLL in physical memory. Doing this saves system memory and reduces swapping.
When the functions in a DLL change, the applications that use them do not need to be recompiled or relinked as long as the function arguments, calling conventions, and return values do not change. In contrast, statically linked object code requires that the application be relinked when the functions change.
A DLL can provide after-market support. For example, a display driver DLL can be modified to support a display that was not available when the application was initially shipped.
Programs written in different programming languages can call the same DLL function as long as the programs follow the same calling convention that the function uses. The calling convention (such as C, Pascal, or standard call) controls the order in which the calling function must push the arguments onto the stack, whether the function or the calling function is responsible for cleaning up the stack, and whether any arguments are passed in registers.
Ripped from
here[
^] ;)
-KR
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