See the DriverCommand
http://doc.developer.milestonesys.com/html/index.html?base=miphelp/class_video_o_s_1_1_platform_1_1_messaging_1_1_message_id_1_1_control.html&tree=tree_search.html?search=drivercommand
Thanks @Bo Ellegård Andersen (Milestone Systems) I will look at that.