A frame is created with the command defframe.... The command
frame... is then used to set the parameters of the frame.
This will indicate the
minimal and maximal values of 
and 
and the x-tics and y-tics.
A frame can be drawn on a graphic object with the command setframe...
The frame will use a rectangular region of the corresponding window. The
defaultlimits of this region are between 
times and 
times the size
of thedimensions of the windows. This can be changed using the command setclip...
Plots can be done on a graphic object with respect to a frame using the commands graphplot_c... and graphline_c...