Require unique login id and password to on client. user can message to admin. admin can post message, read receipt require. one time message to all cleint.
Web based software require on admin login on client side start up feature require. one time authentication. daily ping facility .
only one instant require on client.
"unique login id and password to on client. user can message to admin. admin can post message, read receipt require. one time message to all cleint.
Web based software require on admin login on client side start up feature require. one time authentication. daily ping facility ."
All this this functions is very much doable.