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Hi there,
Sorry for the late reply, got a lot of things to catch up on...
You could think of [history] is as a single sample delay, as a z^-1 operator. It allows you to have feedback loops in the signal processing patch.
(Technically, it holds one 64-bit float in heap allocated memory. During processing, this value is copied into a stack register, and after processing its new value is copied from a stack register back to heap memory for the next sample loop iteration.)
As Joshua mentioned in another post, Max 6 is still in beta and many things are not completely there yet, including documentation for gen~. There will be more soon!
Graham