Many scientists with DEC microcomputers use the RT-11 operating system for the acquisition of real-time data in the laboratory. For these researchers, the work required to learn a new operating system and the time needed to reprogram software prevents them from upgrading their laboratory computer resources. However, there are several advantages in upgrading to Micro RSX, a multiuser, multitasking system. Some advantages include: sharing of hardware resources by many experimental setups, multiterminal support for concurrent data analysis and reduced costs per experimental setup. The paper presents simple techniques for converting Fortran/Macro-11 single-user programs running under RT-11 to run concurrently under Micro-RSX.