How to have an application be in all Spaces on my Mac?

I have also been a fan of virtual desktop managers for aeons , actually a really long time because I started using them when I was using the X Window System on Unix systems back in the late 1980s. Yes, they've been around that long (and yes, so have I :-)

It's nice to have more than one monitor, of course, but that costs money and can be prohibitive when you're traveling too, needless to say. As of yet, I haven't seen anyone set up a multiple-monitor setup at the local café either, but I imagine that's just a matter of time. I mean, us "digital nomads" tend to establish base camp at our tables as it is, so some additional hardware wouldn't be a huge stretch. :-)

More seriously, it's very cool that Mac OS X includes Spaces, a feature you can enable by going to Apple --> System Preferences... --> Exposé and Spaces. It looks like this:

Click on "Enable Spaces" to get started and as you can see, I have three Spaces defined, horizontally adjacent. Switch between then with Control-arrow (either Ctrl + -> or Ctrl + <- moves you around) and, as you know, whatever Space you're in when you start an application is where its window lives.

Except....

Notice on this same window that you can add Applications and assign them to spaces. What isn't obvious is that one of the assignment possibilities is "all spaces". Click on the "+" button to select an application (it'll show you a list of the apps you have running currently and "Other..." to select something else), then click on the tiny up/down arrows to pop up the assignment menu, as I've done that with Twitter utility application Twhirl here:

If you want to assign your Finder windows to live in all Spaces too, it's a bit more tricky, because you have to find the Finder in the first place (cute, eh?) You can do that by looking for Finder in the folder "System : Library : Core Services".

That's all there is to it. Very nice, eh?