RunitAs runs an executable using the specified credentials (domain, user and password) from a limited or guest account. Similar to the Windows RunAs function with more features.
Steel Run-As can run programs, commands and scripts under a different user account than the current logged on user. Run any application,script in alternate user credentials.
AutoIt is a simple tool that can simulate key presses, mouse movements and window commands in order to automate any windows based task. AutoIt features a BASIC-like syntax and can be used as a general purpose scripting language.