Topics to be covered:
1. The frame Sc(L) of joins of closed sublocales of a locale L; motivation (scatteredness).
2. The relation of Sc(L) to the coframe of sublocales S(L).
3. Sc(L) as a "discrete cover" of L, modelling discontinuity.
4. Comparing Sc(L) with the frame of sublocales S(L)op. Advantages, but also a disadvantage.
5. The problem of characterization of S(L) among general coframes, why it would be nice to know more about it.