SQL - Current and Previous Status

Ok...I have a file (ORDERFIL) that has an order number (ORDNUM), a
status (ORDSTAT), and a sequence number (ORDSEQ). The sequence number
is just a one up number - it's not the row number, and it's not
related to an order. However, it will be in order by status for an
order. For a given order number, I want to get the current status and
the previous status. I was thinking along the lines of a select work
order, and then another select (temporary table?) where I select for
that order number and order by sequence number descending. Does this
make sense? Any ideas?

ORDNUM ORDSTAT ORDSEQ
12345 Ship 15
23456 Build 18
12345 Build 13
34567 Process 12
23456 Process 11
12345 Design 05

So I would want to retrieve 12345, Ship, Build; 23456, Build, Process;
34567, Process.

TIA!