+char* MC_request_to_string(smx_req_t req, int value);
+unsigned int MC_request_testany_fail(smx_req_t req);
+/*int MC_waitany_is_enabled_by_comm(smx_req_t req, unsigned int comm);*/
+int MC_request_is_visible(smx_req_t req);
+int MC_request_is_enabled(smx_req_t req);
+int MC_request_is_enabled_by_idx(smx_req_t req, unsigned int idx);
+int MC_process_is_enabled(smx_process_t process);