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Starting TREX 
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1. Log on locally to the host on which the TREX instance is installed with the user <sapsid>adm.
2. Execute the script startsap in any directory:
a. To start a single TREX instance, enter the following:
startsap TRX<instance_number>
In the parameter TRX<instance_number>, you specify which TREX instance is to be started.
b. To start all SAP instances – including all TREX instances – on a host, enter the following:
startsap