Assembly is ESF and RCHK's way of using a single sign-in method for many of the ESF wide managed apps and portals. Technically speaking, it uses your Microsoft account to sign-in instead of Google. Assembly is for ESF/RCHK teachers only (students do not have access to Assembly). You can find it by clicking on the RCHK launcher.

Being able to generate a class list or get important details about your class community is easily done with Gateway.