How to spool with varible?

I need to spool query with the variable filename.
Concept like below ::
select HOST_NAME||'_'||INSTANCE_NAME||'_'||to_char(sysdate,'YYYYMMDD_HH24MISS')||'.txt' as Filename from V$INSTANCE;
SPOOL c:\&Filename;When i run this script it will prompt for input "Filename"
any suggest please.
Regards,
Suradech

SBH wrote:
Do like this
SQL> column spool new_value filename
SQL>
SQL> select HOST_NAME||'_'||INSTANCE_NAME||'_'||to_char(sysdate,'YYYYMMDD_HH24MISS')||'.txt' as File
name from V$INSTANCE;
FILENAME
IN-L-NLAA010009_abbprod_20100726_150322.txt
SQL> spool &filename
SQL> select sysdate from dual
2 /
SYSDATE
26-JUL-10
SQL> spool off
Oh, I forgot to set new_value.
Thank you so much.

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*clip*clip*clip*
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