there is a function called Set_KrlMsg()
it can display up to three values.
if you are ok with displaying just one, lookup MsgLib
if you need more than three, check SWRITE
You will have to change some stuff at the sps file and at the config.dat.
He res a template you may use in both of them:
First of all declare those parameters at config.dat
DECL KRLMSG_T mymessage
DECL KRLMSGPAR_T Parameter[3]
DECL KRLMSGOPT_T Option
INT handle
BOOL msg_one=TRUE
BOOL MSG_PRE=TRUE
BOOL msg_show=TRUEThen those at SPS
INI
msg_one=false
msg_show=false
USER PLC
;FOLD
IF NOT msg_one THEN
mymessage={modul[] "Here's the top of the message", Nr 1000, msg_txt[] " here is its content"}
msg_one=TRUE
handle = Set_KrlMsg(#NOTIFY, mymessage, Parameter[ ], Option)
ENDIF
;ENDFOLD
;FOLD
IF (here you will define when your message will appear) THEN
mymessage={modul[] "here's the top", Nr 1001, msg_txt[] "here's the content"}
msg_show=TRUE
handle = Set_KrlMsg(#NOTIFY, mymessage, Parameter[ ], Option)
ENDIF
;ENDFOLDThat's for KRC4, if your controller is a KRC2 then it's a bit different
After looking in to this a bit more, mine eyes have been opened 
Didn't know about the Programming Messages documentation before, though will probably be fine with MsgLib
Thanks guys
