Shuttling between programs approach

In older systems, people wrote code to transfer from one program to another and back. Because Superbase 1.xx could only keep one program in memory at a time, you had to sometimes save the variables into a temporary file (or in memory safelt) and then transfer out the current program and transfer in another one. These has the same drawbacks as the one form, one program approach in many instances, so we won't repeat them here.