I am trying to get an Excell Workbook to be protected and shared.

There are a few users that I want to have permissions to edit the shared doc.

There are some that I would like to be able to read only.....but make no actual changes to the doc.

Does anyone know if this can be done....and if so is there a step by step tutorial for this some place?

I would also like that this not ask the users that are assigned edit rights for a password...if possible.

Thanks