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Function Description: The ZOOMWHEEL system variable is used to switch the transparently zoom direction when scrolling the middle mouse wheel. Type : Integer Saved in : Registry Initial value : 0 Range : 0,1 System Variable Value: 0 : move wheel... Read More

Another related system variable is ZOOMWHEEL which can toggles the direction of transparent zoom operations when you scroll the middle mouse wheel.   0 :Moves wheel forward zooms in; moving wheel backwards zooms out   1 : Move wheel forward... Read More

Function Description: The ZOOMFACTOR system variable is used to control how much the magnification changes when the mouse wheel moves forward or backward. Type : Integer Saved in : Registry Initial value : 60 Range : 3 ~ 100 The larger of the value,... Read More

Function Description: The MBUTTONPAN system variable is used to control the behavior of the third button or wheel on the pointing device. Type : Integer Saved in : Registry Initial value : 1 Range : 0,1 System Variable Value: 0 : support definition... Read More