The connectivity matrix of the second level de Bruin diagram is often rather large, usually exceeding the capacity of the screen display. Most of the time it is not required, but occasionally one wants to see it; even when it is small there are times when a permanent record is desirable. The option k enables disk output, K suppresses it.
No information is actually written on disk by k or K; they decide whether one of the options that generate strips, periodic or isolated, will write the links on file P0.DAT. Furthermore, the execution of one of those options ( A ... F, M ... R) is the only occasion on which the file can be written.
The file name is fixed; later files will overate earlier ones. To save several files requires executing CAMEX several times, renaming the file every time.
Once produced, a file can be sorted with the DOS utility SORT. Sorted according to either incoming or outgoing links, the lists tend to be more readable than in their natural form, which follows chains as far as possible before returning to branches encountered earlier.