Of course, business computing is by no means limited to these things. You might be surprised at the sophistication of the work in some companies. This is especially true in the financial world, where workstations have caught on as platforms for powerful desktop applications. They failed to dominate the market, but 4GL knowledge is still a marketable skill. If you are looking for a job as an applications programmer, mark a plus beside candidate companies who have successfully incorporated CASE into their development cycle.
Transaction processing is less likely to be the central focus of the programming staff.
UNIX is the most common operating system. And in government and businesses that contract to the government, ADA is the mandated standard. Other than that, it is hard to name standards in such an active and diverse community. Microcomputer and workstation applications. These are ubiquitous.