How to make a singleton dll or exe using C#

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Hello...Everyone...

i want to make a singleton dll or exe using C#,

i want to call the C# dll or exe from C, C++, VB...

The C# dll will be called by any process(C, C++, VB), after any process
call the C# dll, the C# dll have a same instance all of any process , like a
ATL Singleton(Out-of-Service), so i can use a shared data from C# dll

Could you tell me how i can make this kind of dll by C#...

[Marc Gravell]

C# isn't really geared towards creating out-of-process components in
the way you describe.

2 approaches I can think of:
a: Create it as an exe (perhaps a windows service), and communicate
over sockets or similar (since we are talking C etc, remoting isn't an
option)
b: Make it COM accessible, and create (yeuch) create a facade COM exe
in VB6 or similar; the other processes talk to the VB6, which simply
forwards (via COM) to the C#; the VB6 provides the COM server, the C#
provides the CLR framework.

The first is cleaner, but I have seen examples of the second on the
web.

Marc