*call
tool, however, some modules that are particularly close to the kernel of the system
or are used more often are called directly, such as as *tool. These calls are
equivalent for these modules, and so *job is the same as *call job, etc. To
find out about the purpose and useage of the modules, and to see some processing examples,
use the index of SIA modules. A simple mechanism is provided to allow developing and using of alternative versions of
the modules. For example, if we are not satisfied with the module decon
provided with SIA, we'll write another decon storing its files (more exactly,
its parameter definition file (decon.prm) in some directory, say, /usr/my_decon.
If we have a new version of the module thus definewd, by using the card: *alt
decon /rs/my_decon before the actual *call decon, we'll ensure using
this version of the module.