Kinect user Detection

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Also see Jurgeon D’s answer on Kinect SDK player detection, as it deals with skeleton index. @Fixus is also right in that you could use a ID. But if you mean more than 2 people are detected, then only one is detected, that is not programming, that is in the Kinect’s hardware and @FelixK. was right.

Skeletal Index

void nui_SkeletonFrameReady(object sender, SkeletonFrameReadyEventArgs e) 
{
    SkeletonFrame sf = e.SkeletonFrame;
    //check which skeletons in array are active and
    // use that array indexes for player index
    SkeletonData player1 = sf.Skeletons[playerIndex1];
    SkeletonData player2 = sf.Skeletons[playerIndex2];
}

Skeletal IDs

void nui_SkeletonFrameReady(object sender, SkeletonFrameReadyEventArgs e)
{
    SkeletonFrame sf = e.SkeletonFrame;

    if (sf.TrackingState == SkeletalTrackingState.Tracked)
     {
          int ID1 = sf.TrackingID;
     }

Also the code for detecting humans

 DepthImageFrame depthFrame;
 short[] rawDepthData = new short[depthFrame.PixelDataLength];
 depthFrame.CopyPixelDataTo(rawDepthData); 
 Byte[] pixels = new byte[depthFrame.Height * depthFrame.Width * 4];     
 int player = rawDepthData[depthIndex] & DepthImageFrame.PlayerIndexBitmask;

 if (player > 0)
 {
     //do something
 }

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