The double degree exists so that you obtain the equivalent title of the USM plus the one of your university of origin. If you are interested in applying, review the current USM dual title agreements with universities from other countries here.
If your home college has a dual title agreement, please contact Felipe Aguirre (firstname.lastname@example.org) to provide you with more information about the application process.
Once accepted into the program, your studies at the USM will be for 4 semesters (3 subjects, 1 thesis), following a course essentially equivalent to your career at your home university. In some cases there are variations of the duration of the program.