We prove a general convergence result for a multistep time-discrete pr
ocess x(t + h) - x(t) = hV (h, x(t + h), x(t), x(t - h), ..., x(t - Lh
)), t = T + jh, j = 0, ..., sigma(h) - 1, x(T - kh) = z(h), k = 0, ...
, L, parallel-to z(h) parallel-to sigma = O(1) under very mild conditi
ons on the function V. We discuss the application to boundary value- a
nd boundary layer problems. Our proof is a straight-forward argument w
ithout any concepts for stability or consistency.