We present the design for a middleware software and general framework that 
should enable the support for large scale, HLA compliant distributed 
simulations over the Grid. The High Level Architecture was developed by DoD to 
establish a standard for DIS (Distributed Interactive Simulations) and to 
facilitate the reuse of M&S components and simulations interoperability. 
Although HLA is a flexible standard for distributed simulations, it does not 
provide support for issues like easy simulation execution setup, dynamic 
configuration, execution migration, fault tolerance or scalable naming. Our 
framework will try to offer mechanisms to support some of these issues.

The design is based on a current RTI implementation, operating on WAN as a 
backbone, to provide HLA services provisioned in the Federation Interface 
Specification.