How long should be the cover letter of HSMP? Should it be very detailed one e.g. explaining your last qualification and current job in detail and skills also?

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Dear friends, I want to apply for hsmp for which i have completed my documentaion & stuff now just need to send the application to the right address. I have some concerns about it, please someone help me out on the following: 1- What is the correct address to send the application? 2- Can i send ...