V# variables are great tools and absolutely indispensable for Trade Systems and Backtesting and Optimizations. But to have access to historical values of V# variables I need to create User Variable Arrays (AV arrays). Then I can use those historical values in my coding of the trade system (AV.1 or AV.2 or REF(AV,func)). This has proved very useful.
Walk Forward Testing (aka "Realization")
Please review first the Trading System Tools overview page if you are not familiar with the Investor/RT ecosystem of backtesting and system development features.