Let X be surface with isolated singularities in the complex projective
space P3 and let denote Y the smooth part of X. In this note we discuss
some aspects of the topology of such quasi-projective surfaces Y: the
fundamental groups and the associated Galois coverings, the second homotopy
groups and the mixed Hodge structure on the first cohomology group.Comment: version 2 contains new examples and many new references following
suggestions by Ciro Ciliberto and De-Qi Zhan