How is the CSV information stored in the TiledMap?

[SuiHuang]

Hi ArcGIS experts:

    I am studying the Silverlight API demo http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#WebMapCSV
    and I got some basic questions.

    Q1. For the following code.
*************************************************************
Document webMap = new Document();
webMap.GetMapCompleted += webMap_GetMapCompleted;
webMap.GetMapAsync("e64c82296b5a48acb0a7f18e3f556607");
*************************************************************
Seems "e64c82296b5a48acb0a7f18e3f556607" is an id for a map service. How can I make my own map and publish it as such an id?

    Q2. By debugging the code, I found that the retrieved map includes one layer
http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer
         Why is this layer special such that it can provide feature points with tooltips on top of the raster map?

    Any brief direction is appreciated.
    Thank you.

Sui

[JenniferNery · Accepted solution]

Here's some help doc on creating web maps from ArcGIS.com: http://help.arcgis.com/en/arcgisonline/help/index.html#//010q0000001n000000

Actually, the map contains 2 layers: ArcGISTiledMapServiceLayer (base map) and FeatureLayer (contains points from CSV). The webmap JSON http://www.arcgis.com/sharing/content/items/e64c82296b5a48acb0a7f18e3f556607/data?f=pjson includes popup information. In the help doc above, look at "Configuring pop-up windows" section as well.