How can I check all the installed Python versions on Windows

By typing "py -h" or "py --help" I got the help message:

PS C:\Users\admin> py -h
Python Launcher for Windows Version 3.12.1

usage:
C:\Windows\py.exe [launcher-args] [python-args] [script [script-args]]

Launcher arguments:
-2     : Launch the latest Python 2.x version
-3     : Launch the latest Python 3.x version
-X.Y   : Launch the specified Python version

The above default to an architecture native runtime, but will select any
available. Add a "-32" to the argument to only launch 32-bit runtimes,
or add "-64" to omit 32-bit runtimes (this latter option is deprecated).

To select a specific runtime, use the -V: options.

-V:TAG         : Launch a Python runtime with the specified tag
-V:COMPANY/TAG : Launch a Python runtime from the specified company and
                 with the specified tag

-0  --list       : List the available pythons
-0p --list-paths : List with paths

If no options are given but a script is specified, the script is checked for a
shebang line. Otherwise, an active virtual environment or global default will
be selected.

See https://docs.python.org/using/windows.html#python-launcher-for-windows for
additional configuration.

The following help text is from Python:
usage: C:\Program Files\python312\python.exe [option] ... [-c cmd | -m mod | file | -] [arg] ...
Options (and corresponding environment variables):
-b     : issue warnings about str(bytes_instance), str(bytearray_instance)
         and comparing bytes/bytearray with str. (-bb: issue errors)
-B     : don't write .pyc files on import; also PYTHONDONTWRITEBYTECODE=x
-c cmd : program passed in as string (terminates option list)
-d     : turn on parser debugging output (for experts only, only works on
         debug builds); also PYTHONDEBUG=x
-E     : ignore PYTHON* environment variables (such as PYTHONPATH)
-h     : print this help message and exit (also -? or --help)
-i     : inspect interactively after running script; forces a prompt even
         if stdin does not appear to be a terminal; also PYTHONINSPECT=x
-I     : isolate Python from the user's environment (implies -E and -s)
-m mod : run library module as a script (terminates option list)
-O     : remove assert and __debug__-dependent statements; add .opt-1 before
         .pyc extension; also PYTHONOPTIMIZE=x
-OO    : do -O changes and also discard docstrings; add .opt-2 before
         .pyc extension
-P     : don't prepend a potentially unsafe path to sys.path; also PYTHONSAFEPATH
-q     : don't print version and copyright messages on interactive startup
-s     : don't add user site directory to sys.path; also PYTHONNOUSERSITE
-S     : don't imply 'import site' on initialization
-u     : force the stdout and stderr streams to be unbuffered;
         this option has no effect on stdin; also PYTHONUNBUFFERED=x
-v     : verbose (trace import statements); also PYTHONVERBOSE=x
         can be supplied multiple times to increase verbosity
-V     : print the Python version number and exit (also --version)
         when given twice, print more information about the build
-W arg : warning control; arg is action:message:category:module:lineno
         also PYTHONWARNINGS=arg
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd
-X opt : set implementation-specific option
--check-hash-based-pycs always|default|never:
         control how Python invalidates hash-based .pyc files
--help-env      : print help about Python environment variables and exit
--help-xoptions : print help about implementation-specific -X options and exit
--help-all      : print complete help information and exit
Arguments:
file   : program read from script file
-      : program read from stdin (default; interactive mode if a tty)
arg ...: arguments passed to program in sys.argv[1:]

Which tells me that "-0" (zero, not letter "O") lists the available pythons:

C:\Users\admin> py -0
 -V:3.12 *        Python 3.12 (64-bit)
 -V:3.11          Python 3.11 (64-bit)
 -V:3.8           Python 3.8 (64-bit)

also "py --list":

C:\Users\admin> py --list
 -V:3.12 *        Python 3.12 (64-bit)
 -V:3.11          Python 3.11 (64-bit)
 -V:3.8           Python 3.8 (64-bit)

While "-0p" lists not only the versions, but also the paths.