MOLCAS manual: 4.1 Introduction Running MOLCAS 8.1 requires a small number of operations. This section of the manual, entitled Quickstart Guide for MOLCAS is aimed at those users who want to immediately run a simple MOLCAS calculation in order to become familiar with the program. Basic hints are included which set the proper environment, build simple input files, run a calculation, and subsequently extract information from the resulting output.