ok make a trigger and make it activated by whichever side you want, and then put this in the condition field
a1 in thislist or vehicle a1 in thislist or a2 in thislist or vehicle a2 in thislist
and execute a script like this
[thislist select 0] exec "scriptname.sqs"
and in your script put
_guy = _this select 0
_guysname = name _guy
Titletext [Format ["%1 test: 1,2,3", _guysname],"Plain Down"]
and that should do it.