TestStand includes 32-bit TestStand and 64-bit TestStand. You can install and run 32-bit TestStand, 64-bit TestStand, or both on a computer running the 64-bit Windows operating system. 64-bit TestStand is similar to 32-bit TestStand, and, typically, you can edit and execute sequences in either version. However, the following significant differences exist between the two versions that you must consider when you migrate from 32-bit TestStand to 64-bit TestStand or write sequences to run on 32-bit TestStand and 64-bit TestStand.