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saiarusaiaru 

what does it mean? , when value is '1' of Apexpages.currentPage().getParameters().get('print')

UC InnovationUC Innovation
That just means that the query string in your browser URL looks something like:

https://na1.salesforce.com/apex/some_vf_page?print=1

Apexpages.currentPage().getParameters().get('print') reads the "print" query parameter in the URL.