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Any body please help me out when user first login into salesforce show one modal popup box and second time login into salesforce


My requirement is 
I have site  we have two users 1.employee 2.business owner

when employee login first time in to the site should dispaly one poup box with employee related one input fields like 
dob field he filled adnd submit the popup 
and second time login it should display same popup but different  one inputfields like qulification inputfield

Here how we  can catch the how many times user login and logout 

and here we need to display per login one  inputfield


please help its very urgent