Filter questions

Is there any way to see a preview of the effects while you work, so
you can tell what adjusting the different sliders is going to do
before hitting ok?

And is there a way to save your settings as a preset? If I like what a
certain setting does, and want to be able to use it again without
trying to remember the settings?

I'm used to being able to preview changes and save presets with my
other program and just don't see a way to do that with GIMP. I'm sure
there must be a way to at least save the settings and I'm just
overlooking it.