Help with Adept Focus and Infusion Options

[Findar]

First Question: Anybody understand what it means in the Adept Focus where it talks about an adept focus raising the number of power an adept can have activated? The write up says an adept focus doesn't grant new powers so I am at a loss as to how this works.

Second Question: Has anyone played the Infusion metamagic? Has it proved useful? Do you have to leave some power points unallocated to work with Infusion or does it allow your power point total to temporarily increase above your magic rating? Assuming Infusion does allow your power point total to exceed your Magic rating would it be reasonable to drop the power point "burn out" that occurs after Infusion runs out if the character did leave enough power points unallocated to cover the amount received from Infusion? The character would stil have to make the drain save and I would still limit the max number of new powers that can be manifested per the write up.