Custom Archiving related query

In our project I have 2 requirement :

1> Need to create a custom Archiving Object for a custom table and also need to read those data of the custom archiving object from a custom program.

     I have so far created one custom archiving object and done the Write, Delete and Read program and it is working fine as of now. But I am not able to   understand how to Call this object from a custom code to get those data to display / process further.

2> Need to fetch standard archiving data ( Like PM Order, Notification ) from custom ABAP program. How to do the same?

If anybody have any sample code / process then please help me.

Thanks in advance.