When using the Magnifier Glass tool, pressing the Ctrl key switches to the pointing tool temporarily (so that the image can be dragged by mouse).
If the Shift key is pressed while applying the Magnifier Glass, you can move the magnified part of the image aside.
It switches to the Magnifier Glass tool. When a detail is being observed with Magnifier Glass and you press the Z key again, local contrast enhancement is performed inside the magnified area. This feature may help to increase the contrast of dark parts of images that are no more enhanced by the global LUTs settings.
It performs the Edit > Create View Snapshot (8bit RGB) command. The snapshot includes even the magnifier glass tool when the X shortcut is pressed while observing a detail (see above).
Zooms the current image to Fit to Screen mode.
Zooms the current image to the Zoom 1:1 mode.
Zooms the current image to the Best Fit mode.
Increases and decreases magnification of the current image.
Zooming
The mouse wheel serves for zooming images in/out by default. If an ND2 file which includes the Z dimension is opened, the mouse wheel browses through the Z dimension instead. To override this behavior, use the Ctrl key at the same time.
Auto Detection Tools
Some auto detection tools use the mouse wheel for adjusting the detection parameters. This regards for example the Auto Detect tool of the View > Analysis Controls > Binary Toolbar 
, and of the View > Analysis Controls > Annotations and Measurements 
control panels. A typical workflow looks like this:
Select the auto-detection tool (command)
Click inside the image object to be detected. A colored border will appear.
If you are not satisfied with the result, roll the mouse-wheel in order to adjust the detection parameters. The object borders will expand / shrink.
When satisfied, confirm the action by right-click.