https://invisible-island.net/xterm/xtoolkit/
XtInitialize - initialize
#include <X11/Intrinsic.h>
Widget XtInitialize(const char *shell_name, const char *applica-
tion_class, XrmOptionDescRec* options, Cardinal num_options,
int* argc, char** argv);
shell_name
Specifies the name of the created shell widget.
application_class
Specifies the class name of this application, which usually
is the generic name for all instances of this application.
options Specifies how to parse the command line for any application-
specific resources. The options argument is passed as a
parameter to XrmParseCommand. For further information, see
Xlib - C Language X Interface.
num_options
Specifies the number of entries in the options list.
argc Specifies a pointer to the number of command line parameters.
argv Specifies the command line parameters.
XtInitialize calls XtToolkitInitialize followed by XtOpenDisplay with
display_string NULL and application_name NULL, and finally calls XtAp-
pCreateShell with application_name NULL, widget_class applicationShell-
WidgetClass, and the specified args and num_args and returns the cre-
ated shell. The semantics of calling XtInitialize more than once are
undefined. This routine has been replaced by XtAppInitialize.
XtAppInitialize(3)
X Toolkit Intrinsics – C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.1.5.2 XtInitialize(3)