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notification, do a re-window mixing work (the current code is provided by the Exa composite function ) . At this time, as shown, GLX driver is replaced by DRI driver, and DRI driver is no longer an X server and is directly an OpenGL program. In addition DRI (formerly GLX) does not operate the hardware directly, but uses the kernel DRM to drive the operating hardware, which provides the hardware access channel and access mechanism. on the current system, 2D driver is present in xorg in the form

function: CONVERT (dt,e,s), cast ()Mathematical functions: Absolute ABS (n), rounding up Ceiling (n), rounding down Floor (n), specifying Power (n,y), rounding round (n,length), symbol sign (n), square root sqrt (n)Date and Time functions: DateAdd (Datepart,num,date), DateDiff (Datepart,date1,date2), Datename (datepart,date), DATEPART (datepart, Date), GETDATE (), Year (date), month (date), Day (date)String functions: Lower (e), Upper (E), left (E,i), right (E,i), replace (S1,S2,S3) repeats the

, where he conceived the plan of the Advanced Research Project Management Network (Advanced study Projects Administration network,arpanet). At this point, Kleinrock is at the UCLA Network Measurement Center (Network Measurement Centre), which is chosen as the first node for ARPANET. It was here that 1969 BBN successfully installed the first packet exchanger, called the interface Message Processor (Interface messages Processors,imp). The Stanford Research Center was selected as the second node, i