Utility Grids implemenf a virtuuliiarion architecture and nl- lowfor sharing of infrastructure for improved Rerum on invesrmenr(RO1J.Wc consider extending the existing Grid infrustrucrure to SUp[JOrtinteracrive sessions in an enterprise serring. This w,ould allow u.sersto remotelyexecuteinteractive upplicnrionsin the Grid und view their ourput using remore displuy rechnologies. We propose a resourceallocation architecture tosupport such inferactive sessinas in Utilify Grids. End-users submit requestsfor a remote deskrop session A Utility Grid Site Resource Allocation Sysrem assigns a compute nodefor this request consideringpefomnce needs of .such remote desktop sessions. We also pmpose a hieratchinil admission conrml sysrem. The system consists of a Site Admission ControlSysremfor admissioncontrol of remoredesktop sessions.and n Session Admis.yion Contml sysrem at the compute nodefiir admission check of per-application intrraaive sessions. We also presenr discussion on mired workloads...