refers to the structure that saves the state of the Floating-Point Unit (FPU). When a processor switches between tasks, it must save the current math calculations (registers) so they aren't lost. VSO (Virtual Service/System Operations):
Most retail backtesters fail because they only test current stocks or forex pairs. FPState forces you to handle delisted instruments. If you are building a long-term equity strategy, VSO will show you beautiful returns on Apple and Microsoft; FPState will show you the disaster that happened when you held Enron or Bear Stearns. fpstate vso best