This “old school” method of controlling locations in your MicroStation files can still be extremely useful. The 3D tentative point can be especially effective in positioning cameras or target points, where exact snapping is not required, but you can’t quite get what you need from rotating the view or panning the camera.
By using Alt+Tentative in one view, you create a tentative “line” in the other views:
As you move your mouse around another view, your cursor is constrained to that line, meaning it is easier to place a point by eye.
Click the left button in the view to accept the point.