To
Use
Quick Stretch
SHIFT-click on the image and hold while dragging up / down / left / right.
Pan
CTRL-click on the image and hold while dragging the image.
Zoom and re-center
Right-click on the image and select Zoom In or Zoom Out. The image will zoom and pan so that the spot you clicked on is now the center.
-OR-
Point the mouse at the location you wish to be centered, and roll the mouse wheel up to zoom in, and down to zoom out.
Pan Right or Left
Hold down the CTRL key, point the mouse at the image, and roll the mouse wheel up to pan right, or down to pan left.
Scroll Up or Down
Hold down the SHIFT key, point the mouse at the image, and roll the mouse wheel up to scroll up, or down to scroll down.
Select a region of the image
Click and drag the mouse on the image to select a rectangle. The rectangle can be adjusted by gripping an edge (move) or a corner (resize). To keep a square aspect ratio hold down ALT.
Turn on Crosshairs
Right-click on the image and select Crosshairs.
Adjust Information window aperture
Right-click on the image to select the aperture, gap, or background annulus size.
Center the telescope on an object in an image you just exposed
Right-click on the point you want centered, and click Point telescope here. (Note: Auto-center must be calibrated using the Telescope Control window.)
Lock the Information window cursor
Double-click on the image window. You can move the locked cursor around using the arrow keys. (Information window must be open.)
Get Help on any control
Click 
in the upper-right corner of the dialog box, and then click on any control.