How do I obtain customer balance for a range of GL periods?

I have a developer who has written a custom program to list out customer balances for a period or a period range.

1)   Is there a standard report or summary screen I can use to list out the transactions for a period that went into a customer balance

2) is there a standard report or summary that will show me all balance information (total due/paid/outstanding) for each customer for a period or period range?