FIELD SET ONJOIN

Usage: FIELD <field> SET ONJOIN [on|off]

People will see the field whenever they both share a room. So upon entering a room you will see this field for all the users and they will see yours.

Example:
/as field Comment set onjoin on

This is often a good setting for fields that provide descriptive material. It allows you to learn a little bit about each person in the room.