Trying to Understand REGSVR32

I've used regsvr32 in the past, but I really haven't understood what it does.  As I understand them, DLLs (and OCXs) are customarily designed for specific applications, but when I run regsvr32, I'm not referencing a specific application.  When I run regsvr32, am I registering a DLL required by Windows?  iexplore.exe?  explorer.exe?  
jdanaAsked:
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pcfreakerConnect With a Mentor Commented:
Hi,

Indeed you are right, it can be used for both purposes you mention, take a look a this article for you will get a better overview of its options:

http://support.microsoft.com/kb/249873/en-us

Any doubts let me know.

Rgds.
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TG_TechConnect With a Mentor Commented:
It reregister DLLs in the Windows Registry with Regsvr32.

I run the command with a switch and an argument ... Specifying a DLL

Regsvr32.exe usage

RegSvr32.exe has the following command-line options:
Regsvr32 [/u] [/n] [/i[:cmdline]] dllname

/u - Unregister server
/i - Call DllInstall passing it an optional [cmdline]; when used with /u calls dll uninstall
/n - do not call DllRegisterServer; this option must be used with /i
/s  Silent; display no message boxes (added with Windows XP and Windows Vista)


Source --> http://support.microsoft.com/kb/249873
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rpggamergirlConnect With a Mentor Commented:

You use regsvr32 to register and unregister DLLs and OCX.
Regsvr32 will load the specified object and then calls the function UnRegisterServer() in the dll file(if you are unregistering a dll)...or calls the function DllRegisterServer(if you're registering a dll file)
And you can use Regsvr32 not only for files use by Windows(iexplore.exe or explorer.exe) but it can also be called for normal programs.
http://support.microsoft.com/kb/249873
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jcimarronConnect With a Mentor Commented:
jdana--When you register a .dll or .ocx file, you are loading it into memory so it can do its job.  That should happen automatically, but sometimes it does not.
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Shanmuga SundaramConnect With a Mentor Director of Software EngineeringCommented:
regsvr32.exe is a process belonging to the Windows OS and is used to register dynamic-link libraries and ActiveX controls in the registry. This program is important for the stable and secure running of your computer and should not be terminated. You can use the Regsvr32 tool (Regsvr32.exe) to register and unregister object linking and embedding (OLE) controls such as dynamic-link library (DLL) or ActiveX Controls (OCX) files that are self-registerable. This may be necessary to troubleshoot some issues with Windows, Microsoft Internet Explorer, or other programs. Additional information can be found in

http://www.uninet.net/~blaisdel/Regsvr32Info.htm
http://www.experts-exchange.com/Programming/Q_21020348.html
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jdanaAuthor Commented:
Thanks for some terrific responses.
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