extern rmr_mbuf_t* rmr_torcv_msg( void* vctx, rmr_mbuf_t* old_msg, int ms_to );
extern rmr_mbuf_t* rmr_tralloc_msg( void* context, int msize, int trsize, unsigned const char* data );
extern rmr_whid_t rmr_wh_open( void* vctx, char const* target );
+extern rmr_mbuf_t* rmr_wh_call( void* vctx, rmr_whid_t whid, rmr_mbuf_t* msg, int call_id, int max_wait );
extern rmr_mbuf_t* rmr_wh_send_msg( void* vctx, rmr_whid_t whid, rmr_mbuf_t* msg );
extern int rmr_wh_state( void* vctx, rmr_whid_t whid );
extern void rmr_wh_close( void* vctx, int whid );