Transport Expresso has a concept of a Domain Controller system; this is the system that the TE software is installed into and where the TE configuration and data is stored.
It is this system that the client software connects to when users log in and from where the management of systems and transports takes place. All users of TE must therefore have a user account in the chosen system.
It is generally recommended to use SAP Solution Manager for the domain controller system and this must be running SAP NetWeaver 7.0 or above to support TE. However any other high availability SAP NW 7.x can be used.
TE is also installed into all participating SAP systems that are to be managed. In order for the domain controller to communicate with these systems TE RFC destinations and users need to be created.
Please refer to the TE Administration Guide for more information on the architecture, installation and configuration.