tibbr.user(connection, user = NULL)
| connection | a tibbrConnection object indicating the tibbr instance to search. | 
| user | a character string containing the search criteria.  If NULL, tibbr
    returns all users on the tibbr instance.  (Note: This can
    take a long time to return, depending on the number of users on your
    tibbr instance.) tibbr searches the following fields for matches: 
 | 
## Not run: 
con <- tibbr.connect("try.tibbr.com", "myusername", "mypassword")
users <- tibbr.user(con, "Sam")
users
## End(Not run)