If you want to subscribe to GHC and you do not have username and password, you can register

Educational institution access

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If you want to use GHC and you do not have username and password, you can register here:

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IMPORTANT: remember that if you are a student or teacher and what you really want is to view the schedules of your academic institution, check absences, etc. you must do it from the GHC Web APPpage.