This routine cancels the association of an NDF with an ADAM parameter. A subsequent attempt to get a value for the parameter will result in a new value being obtained by the underlying parameter system.

By supplying a blank parameter name, all currently active NDF parameters can be cancelled in a single call. However, it is possible to exclude selected parameters from this automatic cancellation if necessary. To do this, the parameter to be excluded should be marked by making a prior call to this routine with an asterisk appended to the end of the parameter name. Any subsequent call to this routine with a blank parameter name will skip such marked parameters. To mark all currently active NDF parameters in this way, supply the PARAM argument holding just an asterisk.

CALL NDF_CANCL( PARAM, STATUS )

PARAM = CHARACTER $\ast$ ( $\ast$ ) (Given)

STATUS = INTEGER (Given and Returned)

• When cancelling a parameter, the behaviour of this routine is identical to PAR_CANCL.

• Any remaining NDF identifiers for the associated NDF are unaffected by this routine. It’s only affect is to cause NDF_ASSOC or NDF_EXIST to prompt for a new NDF when called subsequently.

• This routine attempts to execute even if STATUS is set on entry, although no further error report will be made if it subsequently fails under these circumstances.