1.Hardware/Software advances
        1.RAMs, Consoles, CD ROMs, DVD, I/O devices
   2.Multimedia
        1.Sound, Graphics, Video Clips, 3D Animation
        2.Realtime polygon based animation
   3.Multimedia development tools
        1.Hypercard, Macromedia's Director, ToolBook, Visual Basic
        2.Microsoft's DirectPlay API (as a part of Windows Game SDK)
        3.Ref. Visual basic 4: Network Gaming Adventure Set, Coriolis Group, 1996.
   4.Shareware (Give away the first product, charge for upgrades)
        1.Id Software's Doom was marketed using the innovative shareware concept.
   5.Multiplayer Gaming Environment
        1.Doom can be played ina networked environment
        2.Compuserve's Sniper
        3.Genie's Air Warrior
        4.Networkprogramming is tricky