Directing which window is changed with :copen

Long a nagging annoyance, I figured it's time to ask. I frequently
will do a :vimgrep on a term under the cursor, but want the resulting
navigation to open in a new window.

$ vim somefile.c
:echo 'In my main code window'
:new
:echo 'I want my vimgrep results HERE'
:vimgrep /pattern/ *.[ch]
:copen

Navigating to my desired entry in the quickfix list and hitting Enter
on the desired line ends up navigating in my original "main code"
window, not in the window I ":copen"ed.

1) how to I know which window the Enter will impact? Vim seems to
have an uncanny ability to choose the one I *least* want to change.

2) how can I tell Vim which window I want the resulting quick-fix
"Enter" navigation to go into?

Thanks,

-tim



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