I was researching how to ensure that a singleton has only one instance within a loaded dll and came up with this: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/bas... The page has a lot of information, and while most of it makes a decent amount of sense, a good deal of it is still unfamiliar territory for me. So I have a few of questions. A) Security Attributes. How important are they? Is it ok to just use null for this parameter, or should I be researching this structure and its effects in depth? B) Size of shared memory. It appears that the 'pseudo file' being used as shared memory is fixed in size and thus I have to guess how much I might need at compile time. Is there a way to resize this file if need be? C) Allocating and deallocating the memory. Is there existing code out there that takes a buffer of memory like this and manages malloc/free like calls to it (possibly wrapping the functionality in a std allocator) or do I need to roll my own? -Jason