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Updating list items in a different site within the same site collection using a custom workflow activity

Thank you, Yevgeniy, for your helpful comments. I was able to find a solution using the Server object model as suggested by Yevgeniy. Thanks also to this blog post. The following code solves the problem.

using (SPSite _site = new SPSite(SiteUrl))
                using (SPWeb _web = _site.OpenWeb())
                    SPList oList = _web.Lists[List];
                    SPQuery _query = new SPQuery();

                    _query.Query = "<Where><Eq><FieldRef
Name='"+Column+"' /><Value
                    SPListItemCollection _itemCollection =

                    if (_itemCollection.Count > 0)
                        _web.AllowUnsafeUpdates = true;

                        foreach (SPListItem Item in _itemCollection)
                            Item[updateCol] = updateVal;

                        _web.AllowUnsafeUpdates = false;

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