How can I pass Global Variable from Page1 to Page2

I have the following senario.
Pag1 - report is based on following PL\SQL
declare
g1 varchar2(100);
begin
g1 = select * from emp where dept = 10;
return g1;
end;
Now I have Page2 - based on following PL\SQL
declare
g2 varchar2(100);
begin
g2 := g1; -- here i want to use variable g1???
return g2;
end;
My question is - How can I use variable g1 from P1 in my new page P2.
Thanks,
Deepak

Hi Andy,
Thanks for the clarification.
I did exactly the same, created a new Region with HTML (PL\SQL) and got the output. it was fine.
Now when I am using exactly the same code in a Report (PL/SQL function returning a SQL Query), I am getting the following error.
DECLARE
g VARCHAR2(100);
BEGIN
g := 'This is a test string';
APEX_UTIL.SET_SESSION_STATE('G_SQL_STRING', g);
htp.p(v('G_SQL_STRING'));
END;
ERR-1002 Unable to find item ID for item "FLOW_SECURITY_GROUP_ID" in application "4000".
ERR-1002 Unable to find item ID for item "G_SQL_STRING" in application "4000".
I am doing the same thing, nothing changed....only difference is in 1st case I am using HTML (PL\SQL) Region and in 2nd case using the REPORT Region (PL/SQL function returning a SQL Query)
thanks,
deepak

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