Finite group actions in dimension 4

We shall discuss 10 open questions about finite group actions on 4-manifolds. The answers to many of these questions are beyond the reach by the current techniques, so hopefully these questions may stimulate inventions of new ideas or methods. On the other hand, we choose these questions in order to explore the differences between the locally-linear, smooth, symplectic, and holomorphic categories in the study of finite group actions in dimension 4, and to understand the subtleties of some of the issues in group actions when being considered under the different categories.