I do progressive filtering a lot. It's convenient to have all the intermediate results somewhere temporarily.

What I do is typing the command in one acme window with the working directory, and middle mouse swipe it. Acme shows the result of that command in a +Errors window with the same working directory. I change the name of this new popped up window (to something like `+Errors-cmd`, type a command that operates on the file name `/mnt/acme/$winid/body`, and middle mouse swipe it again. Acme shows the result of the new command under `+Errors` again. Rinse and repeat until I'm satisfied.

I guess this way it gives a convenient temporary place for all the intermediate texts. I can of course edit them in place if I want.