The window "Domain" displays a domain and a point (u0, v0) in the domain.

The window "Surface: X(u, v)" shows the sphere X(u, v) = (cos(u)cos(v), sin(u)cos(v), sin(v)) and the point X(u0, v0).

The window "Coefficients of 2nd Fundamental Form" window graphs L11(u,v), L12(u,v) = L21(u,v), and L22(u,v) in red, green, and cyan, respectively.

It is possible to click and drag the point (u0, v0) in the domain.