A woman sitting at a table looking at a laptop computer.
A woman is on her laptop computer.
The woman looking at the laptop computer is implied to be "on her laptop computer", unless the laptop was to be specified as closed.
exists e1 e2 s1 x1 x2 x3 x4.(a_topic(x1) & for(e1,e2) & at(e2,x4) & n_computer(x4) & a_laptop(s1) & Theme(s1,x4) & Actor(e2,x2) & v_look(e2) & at(e1,x3) & n_table(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_woman(x1))
exists p1 x1 x2 x3.(on(x1,x2) & n_computer(x2) & of(x2,x3) & n_laptop(x3) & of(x2,x1) & n_female(x1) & n_woman(x1))