Hi.
The Form 11 of EPF is a declaration by the employee for certifying that wherever has has worked/or not worked, he never had a PF account number. The govt has introduced this form in order to stop the system of having multiple numbers of one employee. i.e. suppose you joined A co. you had X PF account no. and later you joined you had Y PF account no. in that case employee should get the PF account transferred thru his employer, that's a responsibility on the employee but nobody does that. in order to save themselves, the employer gets the form 11 filled by the employee and this form is kept with the employer only and it shud be produced before the inspector upon inspection.
For withdrawal of fund before 10 years, the employee can withdraw fund thru form 19 and form 10C and after 10 years thru form 10C and 10D, but after 10 years he can only withdraw provident fund, the pension fund is transferred to employees pension account, which he will get after retirement.
I hope it's clear to you now.
regards,