Using compost

I'm curious what you long-time experts know about spreading finished compost
on your perennial gardens.  Here are some of my questions:

Do you spread it on in Spring only? (i.e., when there are no plants above
ground)
Can you spread it on by itself without mixing with other amendments?
How deep would you spread it--by itself, with other amendments?

Everything I'm reading about it implies you have to dig or rototill it in.
I don't understand now you could do that in an ongoing garden.

Thanks for your help--I'm sure you all have very interesting things to say!

Diann
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