# Io Reference

Databases / Obsidian / ObsidianServer

|  | A network interface for Obsidian. #### Starting a Server
    oServer := ObsidianServer clone
    oServer localObject setName("foo") open
    oServer start
#### Example Client Code
    client := MDOConnection clone setHost("127.0.0.1") setPort(8000) connect
    client onAtPut("1", "aKey", "aSlot")
    client onAtPut("1", "cKey", "cSlot")
    client onAtPut("1", "bKey", "bSlot")
    client first("1", 5) println
    a := client onAt("1", "aKey")
    writeln("a = ", a)
    b := client onAt("1", "bKey")
    writeln("b = ", b)
    client close
The messages accepted by the Obsidian server include:
    onAtPut(id, key, value)
    onAt(id, key)
    onRemoveAt(id, key)
    onFirst(id, count)
    onLast(id, count)
    onAfter(id, key, count)
    onBefore(id, key, count)