title: Command line SSIS (DTEXEC) with Proxy account
body: <p>I know we can start an SSIS package from DTExec.  And when we define an SSIS job in SQL Agent, I can change the Run As to be a pre-defined Proxy account.</p>
  <p>Now, can I run an SSIS package from DTExec, using a Credential(Proxy) account, in a batch file?  I can't find anything in the documentation for that option, but thought I would ask.</p>