Find (Ctrl+F) on this site, for “Process All Tasks” workflow:
http://officebeta.iponet.net/en-us/products/FX101517541033.aspx
Setbulkworkflowtaskprocessingschedule: Stsadm operation (Office SharePoint Server)
http://technet2.microsoft.com/Office/en-us/library/7ae94be6-5c65-43c9-8714-251163260ae81033.mspx?mfr=true
More advance with BulkEdit Task:
http://blogs.msdn.com/andrew_may/archive/2007/01/12/SharePointDefineBulkEditTasks.aspx
