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Starting TREX 
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1. Log on with the user <sapsid>adm.
2. Launch the SAP Management console by double-clicking the program icon on your desktop or by choosing Start ® Programs ® SAP Management Console.
3. In the tree structure, choose the node for the central SAP instance <SAPSID> and navigate to the subnode for the TREX instance <host>_<instance_number> (for example, p123456_77).
4. Choose the right-hand mouse button to access the context menu.
5. Choose Start.
6. Log on with the user <sapsid>adm.
7. Open a command prompt by choosing Start ® Programs ® Instance_number ® Tools ® TREX_<instance_number> so that the environment variables are set correctly.
8. Switch to the <TREX_DIR>/exedirectory and enter the following:
startsap.exe name=<SAPSID> nr=TRX<instance_number> SAPDIAHOST =<host>
In the SAPDIAHOST parameter, you specify the host name on which the TREX instance should be started.

startsap.exe name=ABC nr=TRX77 SAPDIAHOST =p123456