Keys            Action
Left Mouse      Translate (gridgen mode), rotate x, and y (PLOT3D mode)
Middle Mouse    Zoom, rotate z (PLOT3D)
Right Mouse     Translate (PLOT3D)
SHIFT + Mouse   Sparse Mode
b               Make a source active
c               Make a curve active
C               Move center of rotation to center of the active curve
f               Make a patch active
F               Move center of rotation to center of the active patch
g               Save the orientation
G               Restore the orientation
m               Move the active point to an existing point on a curve
n               Move the active source to an existing source and copy spacing
p               Make a point active
P               Move center of rotation to active point
ALT + P         Save the current display window as an RBG image in GridTool.rgb
r               Reset the image
s               Make a surface active
S               Move center of rotation to center of the active surface
t               Move the active point to an existing point on the active surface 
w               Turn the active surface on/off
x               Turn axes on/off
F1              The same as "Next Curve" button
F2              The same as "Next Point" button
F5              The same as "Next Patch" button
F6              The same as "Next Edge"  button
F7              The same as "Find Edge" button
F8              The same as "Reverse the Active Patch" button
F12             Turn Surfaces on/off