Multi-grid applications require some common method for specifying and moving data. Many possibilities could be pursued 
in this area, ranging from grid filesystems to high-performance transport, replication, or catalog approaches. At this 
point in time, based on experience with applications at SC05 and in general during 2005,  the key interoperation area to
 be pursued will be to support a basic method for data specification (i.e. location of data) and movement. Most grid 
efforts plan to support the SRM standard, which is transport-independent however most SRM use is expected to be in 
conjunction with GridFTP.  GridFTP is widely supported..