You can use SQL Server Configuration Manager to set SQL Server startup options. You can specify a trace flag:
Start → Run → SQLServerManager11.msc (or just search SQL Server Configuration Manager)
In SQL Server Configuration Manager, select SQL Server Services.
In the right pane, right-click SQL Server (<instance_name>)and then click Properties.
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: http://technet.microsoft.com/en-us/library/ms345416.aspx