One of the least understood aspects of AD&D in my days of youthful gaming (somewhere after Weapon Speed) was Alignment Languages or Alignment Tongues.
Were they actually different languages or more like regional variations of the common tongue?
Could characters discuss tactics in the middle of battle using their alignment tongue and keep the enemy from ever figuring it out?
We quietly handwaved it away and ignored it after a while - it just seemed like so much useless baggage.
Do you use Alignment Tongues in your campaigns? If so, how do you use it?
What is any houserules do you have for it?
If you used it in the past and no longer do, why is that?