{userinfo:user:property}

Looks up information about an AA user from a stored user id - the kind of id AA keeps in the posted_by and edited_by fields of every item. The first parameter is that user id; the optional second parameter selects what to return. With no second parameter (or any value other than logintime or logintimes) it returns the user display name. The special user id 9999999999 is the anonymous user and always returns the name anonym. An empty user id returns an empty string. Use it on item-display templates to turn the numeric author or editor id into a readable name, for example by feeding the posted_by field into it.