For the stand-alone version, you can pass a filename at the command-line or use
ALT+O to invoke the file-open dialog. The keys recognized by lib openvrml should be
recognized by qtlookat as well, e.g. 'w' toggles wireframe, 't' toggles texture, etc.
You can also use the mouse with the left, middle or right mousebutton for navigation.
Experiment for yourself.

Home:	"reset view"
Left:	"step left"
Up:	"step up"
Right:	"step right"
Down:	"step down"
PageUp:	"switch to next predifined view in scene" 
PageDown:"switch to previous predifined view in scene"
Comma:	"Look left"
A:	"Look up"
Z:	"Look down"
Period:	"Look right"
ctrl-B:	"zoom in"
L:	"light on/off"
T:	"texture on/off"
W:	"wireframe on/off"
R:	"reset user navigation"
Slash:	"show frames/second on/off"
Q:	"quit"
alt-O:	"open file"