Boundaries of Coxeter groups and simplicial complexes with given links

Abstract1.(1) We construct hyperbolic Coxeter groups with boundaries homeomorphic to Pontryagin surfaces.2.(2) For any given finite simplicial complex L we construct a finite simplicial complex K such that the link of every vertex of K is homeomorphic to L.3.(3) We construct an effective action of p-adic integers on boundaries of certain Coxeter groups