Prayer
You can now bury bones, and gain prayer experience.
NPC Dropping
Need a quick way of gaining some loot? Go kill some NPCs.
Ground Items
No use of an item? Just drop it, and it'l appear on the floor, if you change your mind, just pick it back up.
Player vs. NPC
You can now kill NPCs, including attack, block and the death emotes.
Player vs. Player
New and improved combat system, now with attack, block and death emotes.
Shopping
Shops are now available, with the new interface.
Special Attack
Have a godsword or a dragon weapon? Use its special attack.
Food Eating
Injured? Need to heal fast, eat some food.
Combat System
Basic combat system now available, player vs player.
Dual Login
Now compatible with Standard Detail and High detail, resizable and fullscreen also.
Source
Downloaded RS2HD created by Graham Edgecombe.