No code. Just that if you enter certain "buildings", then "stash your treasures" in a chest or similar, save the game, leave the building, then return and empty the chest you can SOMETIMES return to that same building immediately and find the chest still full, thereby giving you access to endless supplies and more importantly, an endless supply of "tomes" so that every character can have maximum points in every box - Strength, dexterity, intelligence, charisma etc.
Using the "endless supplies" cheat it is possible to generate endless supplies of certain types of arrows (ice, fire and arrows+1). Well actually you can create (and carry) bundles of up to 65535 of each of those types of arrows. The trick is to search far places where you actually find a bundle of those special arrows containing more than 20 in a bundle. Once you have them DO NOT USE THEM. Keep them until you can "save" them as described in "endless supplies". Once you have 2 bundles of, say, 23 arrows, bring them together and you'll finish up with one bundle of 20 and one of 26. Discard the 20 and "save" the 26. Then when you have 2 bundles of 26 bring thm together to create 20 and 32. Again, save the larger bundle and continue this process as many times as you like. Be careful though DO NOT attempt to exceed 65535, if you do the bundle shrinks again.
The same trick can be carried out with Ziose gems. There is a place in Buldurs gate where you can find a group of more than 20 ziose gems in one package. By "saving"them as described you can make a bundle of 65535 Ziose gems, in fact you can make any number of bundles each containing those many gems. When you come to sell them they retail at 1.9 million gp a bunch. And the buyer will carry on buying them until you're a "trillionaire!"
AT the character select screen you put the code in to play as Drizzt Do' Urden . When you put this code in you will not hear or see any special indication that that the code worked until you begin your game. I will warn you that if you want to, save you game on this guy, you will need to beat this game on very hard.