sm-farm-register is a Server Farmer management extension responsible for registering new managed hosts in the farm, and generating dedicated ssh keys for them.
add-managed-host.sh - tries to connect to the added server for a few times using ssh, then creates dedicated ssh keys for root and backup users, and executes add-backup-host.sh script from sm-backup-collector extension (if installed on the same management host)
add-dedicated-key.sh - generates new ssh dedicated key for given user and uploads it to managed host