Z/EVES screen shots
The main specification window shows the typeset form of the specification,
and a status indicator showing which paragraphs are typechecked, which have
errors, and which are unchecked. If a paragraph has an associated proof
obligation, a second status bar shows whether it has been discharged.
This picture shows the specification window,
with three typechecked paragraphs followed by an unchecked schema box:

This picture shows the editor window, which provides
buttons and keyboard shortcuts for the Z symbols:

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