I have a worksheet that I want to save and work on a different computer. I get it saved, load it to the other computer, but I can't work on it because it is "READ ONLY". I want to work on it, save it, and bring it back to the original computer. What am I missing?

Thanks for any and all help.
So I save a worksheet on CD.
load it to computer b
save it under a DIFFERENT filename
work on it
save it back to CD
then I should be able to load worksheet with changes to it onto the original computer.

The key is saving it under a different file name?