How to hidde the column from the user

Hi,<br />I want to add a column in the table and also want to hidde that column from the user. So that user's normal
insertionand update goes on (means user will not supply the value for my hidden column). Is there any way to hidde the
columnfrom the user. I tried to make my column (attisdropped setting as true). So now that column is hide from the user
butnow that column will be sometime deleted by postgres. But i do not want that my column should be deleted. Is there
anyway for doing this. Or can you suggest some better way for this. <br /><br />Thanks,<br />Rupesh Bajaj<br />