And then I found it's barely reasonable to run Windows batch files from 9pm rc. Despite rc using Windows path syntax, changes to $path made in rc don't get propagated to the batch file. Also, rc doesn't find batch files in the path.
*And* I can't remember why I started trying to use 9pm! I do like the black and white Sam, but the lack of support for even left and right arrow keys is not fun at all. After using Acme SAC for a while, I've found myself trying to use up and down arrows too. I'm going soft.