See Message Thread above and this reply, courtesy of Michael
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Do you mean short message pop-up's? If so Open Command
prompt (Start, Run, Type CMD then OK) When open
type "Net Send followed by the com outer name/ip address
of the computer you want to connect to followed my the
message. I.e "Net Send 192.168.0.1 This is a message"
or
"Net send Me.MsHome.Net Another message"