to save go to Direct Mode, then type SAVE" and the name of your project, dont use spaces and only 7 letters to load, go to Direct Mode and type LOAD" and the name of what your loading
I haven't done it with more then a few variables but it goes somewhat like so:
Save"txt:' name '", variables to save
You can load it the same way except the variables to save is replaced with where you want to load the data