This allows plain text files to be loaded, and the current document to be saved as a plain text file. This allows the deletion of the current block. It also allows the local lowering of the current block block all the other blocks so that you can get at a block that would otherwise be hidden. Undo does not work in this version. This allows the current default colour and the colour of the block currently being edited to be set.
Colours are primarily to distinguish between different people editing the same document.
You cannot set parts of a block to different colours - only the whole block. The colours have been chosen to be fairly dark, so that text is clearly readable. This allows the current font style and the style of the block currently being edited to be set. The only options supported and normal, italic, bold and bold-italic in a courier fixed font font. This is to enable documents to be saved as plain text, without the problems that would result from variable width fonts.