% kaphelp centroid
will give the description and usage of the CENTROID command. There are subtopics which contain details of the parameters, including defaults, and valid ranges; examples; notes expanding on the description; implementation status; and occasionally timing. For example,
ICL> kaphelp hist param ndf
gives details of parameter NDF in all applications prefixed by HIST.
(From ICL you can also invoke its help system, thus
ICL> help centroid
is similar to kaphelp centroid, though the ICL system has drawbacks, and you are recommended to run KAPHELP.)
The instruction
ICL> kaphelp classified
displays a list of subject areas as subtopics. Each subtopic lists and gives the function of each KAPPA application in that classification. There is also an alphabetic list which can be obtained directly via the command
ICL> kaphelp summary
KAPPA --- Kernel Application Package