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Wide area network (WAN) -based distributedcomputing (DC) has become an active field of research,especially under the label of grid computing. On theother hand, research on WAN-based real-time (RT) DChas remained in an embryonic stage. The situation ischanging, however. Continuous increase in theavailability of optical channels, called lambdas, alongwith steady decrease of their costs, have given rise toefforts to establish optical network infrastructure in whichthe possibility of dynamically allocating entire end-to-endlight-paths to different message streams created by amoderate number of important applications is real. Withsuch infrastructure there is no major obstacle infacilitating RT DC. The notion of RT distributed virtualcomputer (DVC), which can also be viewed as an RTsub-grid, is introduced. Then the challenging issues inadapting some promising technologies established for RTDC in LAN environments to enable realization of RTDVCs in WAN environments are discussed.Programming model and resource management are thefocus of the discussion.