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These strings represent variables when using Button Attributes or Strategy Controller Actions such as Write Line to file/printer and Write Text to another Text String.
They are enclosed in a pair of percent signs.
The parameter needs to be on an open GDW, for the values to update correctly.
For example, %%SpecView.Date&Time%% will display the live value of the SpecView Date&Time parameter when the Write Line to file/printer Button Attribute or Strategy Controller Action is enabled.
Also, %%Zone1.PV%% will display the live value of the PV parameter from the instrument named Zone 1.
Two special kinds of Variable Substitutions are "%%SpecViewInstalledPath%%" and "%%SpecViewProjectPath%%".
These strings point towards SpecView's installed path and the project path respectively.
These strings will mostly be used when utilizing SpecView's Write Line to file/printer Button Attribute or Strategy Controller Action.