I'm here looking at some C source code and I've found this:
fprintf(stderr, _("Try `%s --help' for more information.\n"), command);
I already saw the underscore when I had a look at wxWidget, and I read it's used for internationalization. I found it really horrible (the least intutive name ever), but I tought it's just another weird wxWidget convention.
Now I find it again in some Alsa source. Does anyone know where it comes from?