you can use the GetWorklistItems of the Workflow.Management API.

You will find a sample on the documentation (you can search the sample using the following text: "Global Worklist").

HTH

I saw mention of the Global Worklist in the Developer Reference, however, the only thing that section says is:

"The Worklist sample
code is written for use with Web based forms. Sample code for Windows based
forms will be available in a future release of the Developer's Reference"

I also looked at the GetWorklistItems method but cannot figure out how to filter on Destination

Got it:

            var wfMgr = new WorkflowManagementServer();

            wfMgr.Open(connectionStringBuilder.ConnectionString);

            var criteria = new SourceCode.Workflow.Management.Criteria.WorklistCriteriaFilter();

            criteria.AddRegularFilter(WorklistFields.Destination,SourceCode.Workflow.Management.Criteria.Comparison.Like, "%user_name%");

            var processes = wfMgr.GetWorklistItems(criteria);