Retrieve information about a user.
| Name | Required | Default | Description | Example |
|---|---|---|---|---|
| userName | true | N/A | which user to retrieve | joe |
| usage | false | false | show usage for this web service | true |
| format | false | specified at session open | response output format (json|xml|csv|gchart) | json |
| {userName} may not be null | -4 |