B6限制鼠标移动区域，把鼠标移动的区域限制在一定范围内，点击窗口上的“限制鼠标”按钮后，鼠标即可在上边限制的范围内移动，点击“解锁”即可恢复限制。-B6 mouse movement restriction zone, move the mouse over the area limited within a certain range, click on the window " Limit Mouse"　button, the mouse to the upper limit in the range of movement, click " Unlock"　to restore restrictions.