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You have at least three options in order from best to least-great (in my
opinion):

1. Use LDAP directly to the Identity Vault; simple, libraries abound,
secure, over the wire vs. managing files, etc.
2. Use a Delimited Text driver or something like that to accept a user
and password and then set things.
3. Send in an operation document via dxcmd

Good luck.
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