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Modifying the contents of an existing descriptor or creating a new
descriptor and its associated data is achieved via STDWRC (SCDWRC) for character descriptors, STDWRD (SCDWRD) for
double precision descriptors, STDWRI (SCDWRI) for integer
descriptors and STDWRR (SCDWRR) for real descriptors.
Contrary to keywords, which have a fixed size, the descriptor
data area may be extended at any time.
Again the interface for character descriptors
has an additional parameter as discussed above.