This hazard is present only in pipelines that write in more than one pipe stage or allow an instruction to proceed even when a previous instruction is stalled. The DLX integer pipeline writes a register only in WB and avoids this class of hazards.
The first touchscreen phone was launched in 1992 by IBM.The IBM Simon is also referred as the first smartphone.Simon is the first smartphone to be incorporated with the features of a PDA.
Dell, and other computer companies have all released touch-screen all-in-one devices similar to Apple's iMac. Along with the user experience, another reason Apple could be shying away from touch-screen computers is that its Mac OS X is not a touch-friendly user interface.