Parameters in Tableau are global,single valued and static - they remain constant until manually changed by the user - so once set the parameter value is available throughout the entire workbook.
Parameters alone don't do anything - they must be used in a calculated field and then used (note they can be used in multiple calculations and those calculations can be used in one or more worksheets
Filters values can be passed from worksheet to worksheet directly by applying them to multiple sheets or between dashboards - using actions
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