This can be accomplished by using the GetUserName function in the IBBUtilityCode object in the API. An example of this is shown below:

Private Sub GetNames()
''Provides a list of 100 user names based on the user id number passed 

    Dim oService As REServices
    Set oService = New REServices
    oService.Init REApplication.SessionContext
    Dim oUtility As IBBUtilityCode
    Set oUtility = oService
    Dim i As Long
    For i = 1 To 100    'This assumes that there are 100 users in the system, change this to match your count.
        Debug.Print i & ": " & oUtility.GetUserName(i)
    Next i
    Set oService = Nothing

End Sub

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