Question:Let G be a finite group and X be a G-set. K be a subgroup of G. let i be a group homomorphism from K to G . I am looking for the map i* = res : H^{a}_{G}(X,M) --> H^{i*a}_{K}(i*X,i*M).How can I compute this map for a constant Mackey functor ?  Where a belongs to RO(G) and i*X = X with K action induced by G.
Note: For constant G- Mackecy fuctor M, i*M is M as constant Mackey functor of K.
Can anyone give some hint atleast for X= point.