the way i do it;
function blah(%a,%b,%c)
{
%arg1 = %a;
%arg2 = %b
%arg3 = getField(%c,0);
%arg4 = getField(%c,1);
}
----
%a = "bla";
%b = "bla";
%c = "useful" TAB "data" TAB "here";
function blah(%a,%b,%c);
separating the last field with tabs will let you make as many arguments as you'd like, just retrieve them with getfield