Can a user switch to another channel on pCon.login?

This might be necessary if a member of the organization moves, for example, to another branch of the organization or if a new project team is formed. By means of the Assign user groups feature on the Users page on pCon.login, an organization administrator can move a member to a user group that is assigned to the new channel. Please note: The user has to be removed from the groups in his old channel so that he can access the catalogs and settings of the new channel.
In which cases is it useful to create several channels on pCon.login?
Can a user be assigned to multiple channels on pCon.login?