The manual of the thiefs

      The profession of thief is not dishonorable, albeit is neither honorable nor highly respected in some quarters. Thieves are principally meant to take by cunning and stealth. Thieves have 12 hit points per point of constitution and are the next most skilled in combat, next to fighters, using their backstabbing ability to commence a fight. Due to their need for light quick attacks, a thief is not permitted to wield weapons in two hands, or wear a shield as they hamper his ability to move and strike. If the thief is also a fighter, however, he is permitted to wield two weapons simultaneously.

Also, due to the nature of his dexterous needs, any other armour, other than leather, tends to hamper the thieves skills. Therefore, no thief will wear armour that is more bulky or heavy than this.

Thief Skills
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Steal
      Picking pockets (or folds of a garment or a girdle), which also includes such activities as pilfering and filching small items.

      Stealing is a highly dexterous and highly dangerous act. Those who are caught are likely to find themselves facing death. The ability to lift equipped items off someone is reserved only for the most skilled thieves who concentrate solely on the profession of a thief.

      This practice of sleight of hand can be less dangerously exercised through the palming and slipping of items.
      Commands relating to steal:
            steal {item} from {who}
            palm {item}
            palm {item} from {what}
            slip {item} to {who}

Locks
      Opening locks includes figuring out how to open sliding puzzle locks and foiling magical closures. It is done by picking with tools and by cleverness, plus knowledge and study of such items. A player may attempt at pick a lock as many times as he wishes.
      Commands relating to locks:
            pick lock on {item}

Traps
      This pertains to relatively small mechanical devices such as poisoned needles, spring blades, some magical spells and the like. Finding is accomplished by inspection, and they are nullified by mechanical removal or by being rendered harmless. Only one attempt per 'reset' may be executed to detect a trap. Failure to disarm a trap usually results in its activation.
Note that a trap must be found first before it can be removed.
      Commands relating to traps:
            detect trap on {item}
            disarm trap on {item}
            arm trap on {item}

Stealth
      Hiding in shadows is the ability to blend into dark areas, to flatten oneself, and by remaining motionless when in sight, to remain unobserved. It is a function of dress and practice, as well as experience. Moving silently is the ability to move with little sound and disturbance, even across a squeaky wooden floor, for instance. It is an ability which improves with experience.
      Commands relating to stealth:
            hs       Hide in shadows
            ms       Move silently

Backstab
      Backstabbing is the striking of a blow from behind, be it with a club, dagger, or a sword, before combat has been initiated. The damage that occurs increases with this skill and as the thief becomes more dexterous. Those who focus their training on the skills of the thief will find themselves better able to use weapons against an opponent, especially smaller weapons such as daggers. They may also find stealthy arts of importance to gaining a stronger blow.
      Commands relating to stealth:
            bs {who}       Backstab

Appraise
      With bargaining and charisma, often the true value of items is never really ascertained. A thief can determine the approximate value of certain items with greater efficiency as this skill increases. His ability to negotiate prices for items is also increased; buying for less and selling for more.
      Commands relating to appraise:
            appraise {item}
            scope {who}
            scope {item} on {who}