Editing Prograph (section)

==Execution==
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The integrated Prograph development and execution environment also allowed for visual debugging. The usual breakpoint and single-step mechanisms were supported. Each operation in a [[data flow diagram]] was visually highlighted as it executed. A tooltip-like mechanism displayed data values when the mouse was held over a data-link when stopped in debug mode. Visual display of the execution stack allowed for both roll-back and roll-forward execution. For many users the visual execution aspects of the language were as important as its edit-time graphical facilities.

The most important run-time debugging feature was the ability to change the code on the fly while debugging. This allowed for bugs to be fixed while debugging without the need to recompile.