Equipment
During the course of your adventures, you will gather a good number of items. Some of them can be used (potions, torches, magic scrolls, etc.), others can be equipped (weapons, armors, rings, etc.). Items that are used vanish from your backpack when they are exhausted. Items that can be equipped vanish from your backpack and show up in your status box when they are equipped, and return to your backpack when they are unequipped.
Some items can be used more than once. They have a number of charges which are used up every time the item is double-clicked on. Some other items also have attribute or level requirements. If you do not meet these requirements, you will not be able to use or equip these items and they will remain in your backpack. You can 'right click' most items ingame to see their requirements.
Picking Up/Dropping Items
Items that are left on the ground can be picked up. Simply move your mouse cursor over the item, then click with your left mouse button. The item will disappear from sight and reappear in your equipment window (Ctrl-I).
If you want to drop an item on the ground, you must first open your backpack, move the mouse cursor over the item, click it, then drag it to the 'drop' button and click it again. The item will then appear and remain on the ground. If you wish to destroy an item permanently, drag it onto the junk button instead, and the item will be permanently removed from the game.
Using Items in Backpack
To use a particular item, you must double-click on it using the left mouse button. If the item has multiple charges, it will remain in your backpack until all the charges are exhausted. Every use of the item burns up one charge. Most items (potions, torches, etc.) have only one charge and vanish as soon as they are used.
Equipping & Un-Equipping Items
To equip an item, you will have to open your equipment window (Ctrl+I). Left-click on the desired item you wish to equip in your backpack and drag it to the appropriate window (silhouettes appear in the windows to aid you in choosing the right one). If you do not have the proper requirement(s) for wearing a particular piece of armor or to wield a weapon, it will return into your backpack and an system message will appear at the bottom of your screen letting you know which statistics or requirements you lack.
If you wish to unequip a particular item, open your equipment window (Ctrl-I), Click the item you wish to remove, and drag it back to the inventory grid to drop it off. Note that you can not remove, drop, or in any way junk or get rid of the Gem of Destiny. This item saves your life when your Hit Points drop to 0 or below and teleports you back to the temple (we know you'll reconsider getting rid of it now).