Runndll.exe Rundll32.exe
(Microsoft)
Microsofts "Run a DLL as an App". A DLL is a Dynamic Link Library. In layman and [very] simplistic terms a DLL is a portion of a software program which is only used by the main program as and when specific features of the software are used by the end user (for instance the PRINT function in your wordprocessor). The main advantage is that, using this technique, programmers can develop software which does not end up gobbling up memory through the whole program loading in one go, but which instead only uses enough memory for the core functions of the program, with specific features, implemented in separate DLL files, only loaded as and when the end-user decides to use them (ie. the Print DLL will only be loaded into memory when the end-user clicks on PRINT). Another advantage is that the software developers can also have common features which they have implemented across a range of their programs, implemented just the one time as a shared DLL which is used by all that developers programs. RUNDLL and RUNDLL32 are the Microsoft Windows programs that need to be used to load DLLs into memory so that they can be used by specific programs or by Windows.
Recommendation :
RUNDLL and RUNDLL32 do not normally appear in the Task List in Windows. In our experience they tend to appear only when you are already having problems of some sort with your PC. This is not to say, however, that if you see RUNDLL or RUNDLL32 in your Task List, you should be worried. If you see either in your Task List, simply leave it alone. We are not sure as to why RUNDLL or RUNDLL32 can sometimes suddenly appear in the Task List, but we believe you should leave them alone.