Multitasking in vim - is that exists?

I use vim a lot and now I'm starting to love using tabs
(:tabnew, :tabfirst...),but I found that execution of the external
command in one tab blocks the whole vim process.

For example when I execute :make in one tab, I need to wait until this
make finish. Will be very nice if someone provide me a solution how I
can use other tabs in vim when I'm waiting something to finish in
another opened tab. I still need the :copen output of :make command to
be displayed in execution tab. I have same problem with :grep
or :Ack(from :Ack module)...

Regards,
t0d0r

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