How to create a NOTIFY process by clicking a button

hii all,

i have a requriment of placing a NOTIFY button  in interface , once a new request is entered into a approval interface he has to take an action , once he took an action he needs to notify the remaining users by sending a mail by clicking a NOTIFY BUTTON , based on the request status we should sent an email by clicking NOTIFY USER BUTTON with request id , its like a push notification by sending a mail, based on request status we will sent different mails.

thanks in advance 

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