To get the current user on an interactive Visio page (top left corner of image), I ended up using the element Custom Properties and an Automation script which updates the custom properties.  I created a custom property for the User, Date and different configuration parameters which we used for highlighting current selections for the different pick lists.

If needed, following is the script used, where custom note was added to allow users to comment on what the test was for and if it needed to remain in place for a period of time.  Letting others know the equipment was in long term use.

public class Script{
/// <summary>
/// The Script entry point.
/// </summary>
/// <param name="engine">Link with SLAutomation process.</param>
public void Run(Engine engine)
{
var vCustomNote = engine.GetScriptParam("CustomNote").Value;

string strNow = DateTime.Now.ToString("yyyy-MM-dd h:mm:ss tt");
ScriptDummy dummy= engine.GetDummy("dummy1");
dummy.SetPropertyValue("MSUser", engine.UserDisplayName);
dummy.SetPropertyValue("DDDate", strNow);
dummy.SetPropertyValue("CustomNote", vCustomNote);
}
}