changing the desktop environment

[mick crane <mick.crane@gmail.com>]

hello,
It is a long time since I fiddled with the display.
is buster.
there are the names
display manager which is lightdm
desktop environment which is mate
and window manager which I think is part of mate

If I want to change desktop environment do I need a window manager ?
I'm not seeing anything looks like a window manager in output
of "ps ax"

How do I change desktop environment ?
Is it
"update-alternatives --config x-window-manager"

just asking because I don't want to bugger it up

mick

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