Xilinx FPGA Editor + Line Names?
Unfortunately, you're walking in uncharted territory. Xilinx has provided very little documentation on the low-level structure of their FPGAs.

That being said: the objects you're looking at are all different types of wires connecting elements in the FPGA. The names have to do with the length of the wires; for instance, OMUX is a very short wire, and HLONG is a much longer one. There are some more details on the routing structure of the Virtex-4 FPGA in section 6.6.6 of Generating the Communications
Infrastructure for Module-based Dynamic
Reconfiguration of FPGAs. They won't match exactly with the Spartan-3E you're using, but there will likely be some similarities.

The numbers are almost certainly coordinates specifying the location of these specific wires within the FPGA.