system table scan

Hi,
I created an additional system table that i need in my system. The table 
contains attributes (username, att1, att2, ...)
I need to scan the table for a certain username while retrieving the tupled 
ordered by att1.

If i understand correctly, i may use systable_beginscan() and 
systable_getnext() to scan a system table while specifying a key (e.g., 
username='user1'). But i know nothing about specifying the order of the 
scan.

Should i implement my own table scan functions then? Or there is any 
mechanism that i may reuse?

Thanks a lot,
Ehab

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