Beside globals, ST/X supports another scope for variables,
which has the same lifetime as globals, but is only visible
to workspace evaluations. These are called Workspace Variables.
They allow for an object reference to be shared between workspaces
and is very useful when debugging.
Workspace variables can be declared interactively via a dialog,
or the workspace setting is changed to have unknown variables automatically defined as such.
However, this automatic definition is limited to workspace evaluations.