Any QUICK, QUIZ, or QTP programs could be run compiled (converted to machine language) or uncompiled (source code). Compiled programs generally ran faster, but there had to be a good method to modifications to the source code so as to not corrupt the object code. QUICK screens were used primarily for data entry, and could call other QUICK screens, QUIZ reports, or QTP applications to update data. Also, there were a few things that had to be done to the source code in order to generate compiled code. For example, the GO command to run the source code was equivalent to the BUILD command to generate the compiled code.