MMPV posting periods

Dear friends,

What is MM period,EXcise period will be there, and FI period,whether these are different.

Our client,Close the period from 25th to 24th of next month. This he will do all the months except two months in the year.

In MMPV,how to close it . What is this from to period in MMPV.

Regards,

CAnand