Very easy to do.  Create a basic class (assuming you are using typescript) and 
make sure use the 'export' modifier. Create a variable in that class that will 
hold your global value.  Add that class as a provider.  If you don't know what 
that means, do a quick review - or let me know. Once you have that done, inject 
that class by including it as an argument in the constructor of any class where 
you intend to use it.  Once again, if this means nothing to you, let me know.  
The global class you are now using is a singleton, so that allows for a great 
way to manage state in your app.  If you don't know what a singleton is ... you 
know the drill.

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