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+= Ad hoc environments with access to...
+
+== A top level package from the Nixpkgs/NixOS repo
+
+....
+$# ../../../start-shell nix shell nixpkgs#cowsay <<EOL
+$ cowsay "moo"
+$# EOL
+....
+
+== A flake
+
+In this example, we will use a flake defined in a remote git repo.
+However, you can use any of the flake reference styles defined in <<#flakeref>>.
+
+....
+$# ../../../start-shell nix shell git+https://codeberg.org/mhwombat/hello-flake <<EOL
+$ hello-flake
+$# EOL
+....
+