You can get the current list of containers available via the container registry documentation. As mentioned already, the Docker desktop extension can also visualize what's available.
Glad to hear the interest in Python.
When you use embedded python, IRIS loads Python into memory in the process (via CPython). The specific version of Python depends on your OS. That's documented here: https://docs.intersystems.com/irisforhealthlatest/csp/docbook/DocBook.UI...
Loading Python into the IRIS process does just what you think it does - not a separate process and references in Python to ObjectScript objects are in-memory. So there's no performance difference between using Embedded Python from IRIS or starting with a Python program and `import iris`.
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Parameters aren't available in embedded python. An easy workaround is to create a Property that reflects the parameter or to create an objectscript method to return the parameter.
I'm curious about the use case.