Interaction between scripts and non-scripts

• Having a single program running in two different languages is difficult.
• It's not impossible, but most languages have evolved to run by themselves.
• There are a lot of questions.
• One has to do with multiple processes running.
• It's easier if there's just one.
• In that case, the master language can call out to the slave. However, how is that call made?
• How are variables or memory in general translated.
• You can have more than one language, and each new one adds new complexity.
• This is ignoring the issues of having to program in two langauages.