PUTHEADER( param_name, value )

Set the value of a parameter associated to the currently JOINed
data-set. If the parameter already exists, the value is changed,
otherwise it is created. Any parameters can be used. Gifa already
uses the following parameters (as listed with the dataset command) :
Frequency, Freq1, Freq2, Freq3, Specw1, Specw2, Specw3, Offset1,
Offset2, Offset3, Type, Dim.
But you can use any other parameter name if you wish.

see also : join newfilec getheader

NPK Documentation, version 0.995 - 2009-10-14