You could also use the ASDK AeXAgentLib..::.DisplayBalloon Method.
VBScript
set sessmgr = agent.SessionManager
set sessions = sessmgr.Sessions
set session = sessions.Item ( 0 )
cookie = session.DisplayBalloon ( "Balloon 1 Title", "Balloon 1 Message", 2, 30, Nothing )
wscript.Sleep ( 5000 )
cookie = session.DisplayBalloon ( "Balloon 2 Title", "Balloon 2 Message", 3, 30, Nothing )
AltirisASDKAgent.exe cmd:DisplayBalloon title:"Balloon Title" message:"Balloon Message" iconType:2 timeout:30