I use FB v. WI-T1.0.0.679 on W95.

This is the first time I need to use an UDF.

Namely, I need to use the RAND function that I understand to be in
IB_UDF lib.

IB_UDF.DLL is in the E:\FIREBIRD\UDF directory, together with
FBUDF.DLL .

Using Marathon, I write:

DECLARE EXTERNAL FUNCTION rand
RETURNS DOUBLE PRECISION BY VALUE
ENTRY_POINT 'IB_UDF_rand' MODULE_NAME 'ib_udf';

commit

select rand from rdb$database

...and I get an error message stating that 'rand' is a column unknown
to FB.

Where is the mistake ?

TIA

Duilio Foschi