AdiIRC

Consider my example below:

Script:

dialog example { 
   title "Example" 
   size -1 -1 412 248
   edit "", 4, 130 20 276 121, left, multi, vsbar
   button "Done", 3, 110 150 70 30, cancel 
}

open it by doing:

/dialog -m example example

while the dialog is still open type:

//did -i example 4 1 first | did -i example 4 2 second | did -i example 4 3 third | did -i example 4 4 fourth

then insert something on the first line by doing:

//did -i example 4 1 insert to first line

notice that it inserted the text on the last line instead of the first.