What is the concept of an attach/detach point in project finance? Particularly related to a unitranche financing.

Hi all, I need a primer on unitranche financing, including about the idea of an attach/detach point and how that works. I've googled it and the top results relate to CDOs, and I frankly just need it spelled out to me a little bit more clearly on what a unitranche is in project finance (vs. maybe a 1L/2L structure) and how the concept of attach/detach points apply. Many thanks. 

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