catopen [-fail|-nofail] catname
Open the message catalog catname. This may be a
relative path name, in which case the NLSPATH environment
variable is searched to find an absolute path to the message catalog.
A handle in the form msgcatN is returned.
Normally, errors are ignored, and in the case of a failed call to
catopen, a handle is returned to an unopened message
catalog. (This handle may still be passed to catgets and catclose, causing catgets to simply return the default
string, as described above. If the -fail option is
specified, an error is returned if the open fails. The option
-nofail specifies the default behavior of not
returning an error when catopen fails to open a
specified message catalog. If the handle from a failed
catopen is passed to catgets, the default string is returned.