Once you have the associations and hot keys set up, any window in that text editor can be a new workspace file. I recommend that you save the different files with a .sk extension.
It is pretty cool.
Not quite as powerful though you can also have code in .sk files and you can drag and drop it into the SkookumIDE (old WinAPI UI version) and it will run all the code. This can be used as a crude toolbar.