What are the effects of not detaching a Shared Memory Segment?

Not detaching will prevent others from deleting the memory segment, this is true on windows and on linux. Thus you will have a memory leak. It won't compromise the stability of the O.

S but why won't you want to detach and delete the segment once you finish using it?

If shared memory segment is not detached then the kernel keeps on thinking that the particular segment (kernel call it region) is in use and would never mark it for deletion - kind of reference counting mechanism is used internally. Another problem, would be that process' virtual address space would be eaten up unnecessarily.

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