Program execution may be performed in more than one way. The simplest is the one function call one:
status = x1f4_link_shuffle(program, context);
context parameter is the program execution context and it is passed
to the C functions implementing the interpreted language allowed functions and
operators. It is not used by the application extension programming language
interpreter, nor by the functions implementing the libx1f4i0 functions
and operators sets, nor by the standard output printing function set. Thus, in
this example, it may well be set to NULL (or any value).