> how can we create a user from our programs?
>
> is there CREATE USER syntax?

No, you have to attack directly the isc4.gdb database, where the users of
the database are stored. With a simple insert into a table of this database
you will have your user added, but ensure that the password is encrypted
when you store it in the database. To do all this, however, you *must* be
the SYSDBA.

HTH,

Xavi.