(dbus:with-open-bus (bus (dbus:session-server-addresses))
  (dbus:invoke-method (dbus:bus-connection bus)
                      "MyMethod"
                      :interface "org.krwq.MyService"
                      :path "/org/krwq/MyService"
                      :signature '(:string :string)
                      :arguments (list "a" "b")
                      :destination ":1.12100"))