Possible to store a variable in one comp and accessible to all other comps.

Hi There,
This question is mainly for architectural reasons.  Is there a way within the After Effects project file, to declare a global variable that is accessible to all comps?  I want to simply define a variable, set its value, and have that variable accessible to all the comps in the project.  Is there an "order" to which expressions get evaluated first?
Any pointers or tips are greatly appreciated.
Thanks!

Hi Dan,
Thank you for your time and reply.  I am only trying to get access to a string from any comp.  I never thought about using a Composition object as a container for global variables, but your hint about the slider made me think of that.  Since I am only trying to get a string, I simply used a text layer that shows the actual string I want, so from any other Composition, I just reference the sourceText.text property of that text layer as per Javascript's DOM.
Thanks!

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