Get the activation properties of a workflow from a page external to the workflow

Question

I'm trying to get the activation properties you bind on the activity OnWorkflowActivated in an aspx page which doesn't belong to the workflow. It looks like I'm able to get to the workflow this way

SPWeb thisWeb = new SPSite(new Guid(Request.Params.Get("siteid"))).OpenWeb(new Guid(Request.Params.Get("webid")));
item = thisWeb.Lists[new Guid(Request.Params.Get("listid"))].GetItemById(int.Parse(Request.Params.Get("itemid")));
workflow = item.Workflows[new Guid(Request.Params.Get("workflowid"))];

But after that I'm blocked and I don't know how to go one and get to the activation properties. Any idea?