status.i4.v = acl_register_host_request_func(request_func.f.v)

	This routine registers a host request function for the Accelerator
	Command Language (ACL).  A host request function is the means for
	an ACL script (through the use of the "host_request" command) to
	pass a request to the program which executed the script.

	request_func	null terminated symbol name
			(called as follows:
			 status.i4.v = request_func(request_string.i1a.r))

	This function returns ACNET status values as follows:

	CLIB_OK			success
	CLIB_DUPREQ		a function has already been registered

	This function requires the following include files:

	acl_h, acnet_errors.h

	Related functions:

	intro_acl, acl_unregister_host_request_func, acl_execute_c,
	acl_file_execute_c, acl_file_read_c, acl_file_write_c, acl_compile_c,
	acl_free_c, acl_read_symbol_c, acl_read_symbol_info_c,
	acl_read_symbol_names, acl_delete_symbol, acl_info_c,
	acl_cancel_requests_c, acl_set_symbol_c, acl_default_data_source_c,
	acl_log_file_c, acl_default_script_path_c, acl_script_is_executing,
	acl_translate_command_string, acl_file_read_description_c,

	C/C++ usage:

	int	status;
	acl_host_request_function	request_func;

	status = acl_register_host_request_func(request_func);