As of Radio 8.0.7 (26 March 2002)

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methodName: xmlStorageSystem.ping
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==REQUEST

Params:
     (1) int - user number
     (2) string - password (md5'd?)
     (3) int - 0 (I'm connected) 1 (I'm disconnecting)
     (4) int - client port
     (5) struct - user info struct

User Info Struct:
     email:
        String
     flBehindFirewall:
        int (boolean)
     name:
        String (full name of user)
     organization:
        String (user's org name. used for?)
     serialNumber:
        String
     url:
        String (root URL of user's weblog)
     weblogTitle:
        String


==RESPONSE

Params:
    struct - ping reply struct

Ping Reply Struct (if param 3 is 0):
    cloudData:
        struct: (cloud data struct)
    flError:
        boolean
    message:
        String ("Thanks for the ping, bob")
    yourUpstreamFolderUrl
        String (root URL of weblog again)

Ping Reply Struct (if param 3 is 1):
    flError:
        boolean (0 means logged out)
    message:
        String ("See you later, Bob")
    yourUpstreamFolderUrl
        String (root URL of weblog again)

Cloud Data Struct:
    ctAccesses:
        int (?? number of method calls?)
    ctBytesInUse:
        int (presumably the cloud disk quota)
    ctBytesUpstreamed:
        int (total of all upstreamings, not just current usage)
    ctFileDeletions:
        int (presumably for all time)
    ctSignons:
        int (presumably for all time)
    ctUpstreams:
        int (ditto)
    email:
        String
    flBehindFirewall
        boolean (as in request)
    flNewUser
        boolean (only appears if this is the very first ping)
    flSignedOn
        int (boolean)
    ip
        String (IP of connecting client (may be proxy))
    messageOfTheDay
        String (may contain escaped HTML)
    name
        String (user's full name as in request)
    organization
        String (as in request)
    port
        String (as in request)
    rssHotlistData
        struct (RSS Hotlist Struct) - (optional? Presumably if RSS sharing isn't on...)
    serialNumber
        String (as in request)
    url
        String (as in request)
    userAgent
        String (HTTP USER_AGENT)
    usernum
        String (user id)
    weblogTitle
        String (as in request)
    whenCreated
        dateTime.iso8601
    whenLastAccess
        dateTime.iso8601
    whenLastSignOff
        dateTime.iso8601
    whenLastUpstream
        dateTime.iso8601



 RSS Hotlist Struct:
    f:
        String (path to subscriptions.opml on server. Possible security risk)
    urls:
        struct (URL Struct)
    whenLastCompiled:
        dateTime.iso8601
    whenLastUpdated:
        dateTime.iso8601

 URL Struct:
  while (more subscribed RSS feeds) {
    [URL of RSS Subscription]:
        boolean: (when is this _not_ 1?)
  }