The "Lock Command Reference" hopefully does the job[1].In an image where you want to use the dev_pharo7 for a project, you do a Metacello lock on github://xxxx/xxx:dev_pharo7/src BEFORE loading the project ... if there are multiple projects that need to all coordinate development then you follow the same convention and use a Metacello lock for each of the projects ... Executing expressions to lock projects is tedious to use and manage.Do you have a text explaining what is a lock? I do not understand the problems locks solve.