SE09 is the transaction code for workbench organizer. Workbench organizer is the set of utilities for development change management. All Development changes are tracked via Workbench organizer.
SE10 is for Customizing organizer. Customizing organizer is the set of tools for customizing change management. All customizing changes are tracked via customizing organizer.
SE01 is the main screen of the Change and transport Organizer. From here the administrator can achieve all tasks related to transport requests – such as create, change, view logs, display client/delivery transports, etc. SE09 and SE10 can also be accessed from here. However, not all developers might be granted access to this transaction.