Many of the subprograms described in the following sections have Arguments that are optional. In such cases they must be totally omitted and not indicated by adjacent commas. Thus the number of arguments present is used to indicate whether optional arguments have been specified or not. Thus the following two examples are valid:-
STATUS = UI_INITIALIZE(1,2,5,6,65536)
STATUS = UI_INITIALIZE(1,2)
because the optional arguments omitted are all trailing ones, whereas the following is invalid:-
STATUS = UI_INITIALIZE(1,2,,,65536)
For VAX/VMS Systems only , missing optional arguments may be indicated by adjacent commas. In the following Sections, optional arguments are denoted by being enclosed in square brackets, thus:-
(PROMPT,VALUE[,LOLIM,HILIM])
indicates that LOLIM and HILIM are both Optional Arguments and may be omitted
from the Calling Sequence.