/target Tankname
/assistTargets a named player and picks up whatever they are fighting. Keeps a whole group on one target without anybody calling it out loud.
Fires your taunt and tells the group you have aggro, so the damage dealers hold off until threat exists. One ability, one command — exactly what EQ2 macros are good at.
/useability "Taunt"
/g Aggro is mine, go ahead