diff --git a/include/astaroth.h b/include/astaroth.h
index 1aef514..9befcee 100644
--- a/include/astaroth.h
+++ b/include/astaroth.h
@@ -28,6 +28,17 @@ extern "C" {
 #include "astaroth_grid.h"
 #include "astaroth_node.h"
 
+#define acInit(x) acGridInit(x)
+#define acQuit() acGridQuit()
+#define acLoad(x) acGridLoadMesh(STREAM_DEFAULT, x)
+#define acReduceScal(x, y) acGridReduceScal(STREAM_DEFAULT, x, y)
+#define acReduceVec(x, y, z, w) acGridReduceVec(STREAM_DEFAULT, x, y, z, w)
+#define acBoundcondStep() acGridPeriodicBoundcondStep(STREAM_DEFAULT)
+#define acIntegrate(x) acGridIntegrateStep(STREAM_DEFAULT, x)
+#define acStore(x) acGridStoreMesh(STREAM_DEFAULT, x)
+#define acSynchronizeStream(x) acGridSynchronizeStream(x)
+#define acLoadDeviceConstant(x, y) acGridLoadConstant(STREAM_DEFAULT, x, y)
+
 #ifdef __cplusplus
 } // extern "C"
 #endif
diff --git a/include/astaroth_defines.h b/include/astaroth_defines.h
index 1441967..0d03b70 100644
--- a/include/astaroth_defines.h
+++ b/include/astaroth_defines.h
@@ -105,7 +105,7 @@ typedef enum {
 } ReductionType;
 
 typedef enum { STREAM_DEFAULT, NUM_STREAM_TYPES } Stream;
-#define STREAM_ALL (-1)
+#define STREAM_ALL (NUM_STREAM_TYPES)
 
 #define AC_GEN_ID(X) X
 typedef enum {
diff --git a/include/astaroth_grid.h b/include/astaroth_grid.h
index 7dfe323..3fb5f8f 100644
--- a/include/astaroth_grid.h
+++ b/include/astaroth_grid.h
@@ -31,7 +31,7 @@ AcResult acGridInit(const AcMeshInfo node_config);
 AcResult acGridQuit(void);
 
 /** */
-AcResult acGridSynchronize(void);
+AcResult acGridSynchronizeStream(const Stream stream);
 
 /** */
 AcResult acGridSwapBuffers(void);
@@ -72,34 +72,27 @@ AcResult acGridStoreVertexBuffer(const Stream stream, const VertexBufferHandle v
 /** */
 AcResult acGridStoreMesh(const Stream stream, AcMesh* host_mesh);
 
-/** */
-AcResult acGridTransferVertexBufferWithOffset(const Stream stream,
-                                              const VertexBufferHandle vtxbuf_handle,
-                                              const int3 src, const int3 dst,
-                                              const int num_vertices);
-
-/** */
-AcResult acGridTransferMeshWithOffset(const Stream stream, const int3 src, const int3 dst,
-                                      const int num_vertices);
-
-/** */
-AcResult acGridTransferVertexBuffer(const Stream stream, const VertexBufferHandle vtxbuf_handle);
-
-/** */
-AcResult acGridTransferMesh(const Stream stream);
-
 /** */
 AcResult acGridIntegrateSubstep(const Stream stream, const int step_number, const int3 start,
                                 const int3 end, const AcReal dt);
+
 /** */
-AcResult acGridPeriodicBoundcondStep(const Stream stream, const int3 start, const int3 end);
+AcResult acGridIntegrateStep(const Stream stream, const AcReal dt);
+
 /** */
-AcResult acGridReduceScal(const Stream stream, const ReductionType rtype,
-                          const VertexBufferHandle vtxbuf_handle, AcReal* result);
+AcResult acGridPeriodicBoundcondStep(const Stream stream);
 /** */
-AcResult acGridReduceVec(const Stream stream, const ReductionType rtype,
+/* acGridReduceScal(const Stream stream, const ReductionType rtype,
+  const VertexBufferHandle vtxbuf_handle, AcReal* result); */
+AcReal acGridReduceScal(const Stream stream, const ReductionType rtype,
+                        const VertexBufferHandle vtxbuf_handle);
+/** */
+/*AcResult acGridReduceVec(const Stream stream, const ReductionType rtype,
                          const VertexBufferHandle vec0, const VertexBufferHandle vec1,
-                         const VertexBufferHandle vec2, AcReal* result);
+                         const VertexBufferHandle vec2, AcReal* result);*/
+AcReal acGridReduceVec(const Stream stream, const ReductionType rtype,
+                       const VertexBufferHandle vec0, const VertexBufferHandle vec1,
+                       const VertexBufferHandle vec2);
 
 #ifdef __cplusplus
 } // extern "C"
diff --git a/src/core/astaroth.cu b/src/core/astaroth.cu
index 1ef56d4..5de6d24 100644
--- a/src/core/astaroth.cu
+++ b/src/core/astaroth.cu
@@ -17,3 +17,15 @@
     along with Astaroth.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include "astaroth_defines.h"
+
+#define AC_GEN_STR(X) #X
+const char* intparam_names[]   = {AC_FOR_BUILTIN_INT_PARAM_TYPES(AC_GEN_STR) //
+                                AC_FOR_USER_INT_PARAM_TYPES(AC_GEN_STR)};
+const char* int3param_names[]  = {AC_FOR_BUILTIN_INT3_PARAM_TYPES(AC_GEN_STR) //
+                                 AC_FOR_USER_INT3_PARAM_TYPES(AC_GEN_STR)};
+const char* realparam_names[]  = {AC_FOR_BUILTIN_REAL_PARAM_TYPES(AC_GEN_STR) //
+                                 AC_FOR_USER_REAL_PARAM_TYPES(AC_GEN_STR)};
+const char* real3param_names[] = {AC_FOR_BUILTIN_REAL3_PARAM_TYPES(AC_GEN_STR) //
+                                  AC_FOR_USER_REAL3_PARAM_TYPES(AC_GEN_STR)};
+const char* vtxbuf_names[]     = {AC_FOR_VTXBUF_HANDLES(AC_GEN_STR)};
+#undef AC_GEN_STR
diff --git a/src/core/grid.cu b/src/core/grid.cu
index 83c7453..7a05d22 100644
--- a/src/core/grid.cu
+++ b/src/core/grid.cu
@@ -17,3 +17,172 @@
     along with Astaroth.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include "astaroth_grid.h"
+
+#include "astaroth_node.h"
+
+const size_t MAX_NUM_NODES = 32;
+size_t num_nodes           = 0;
+static Node nodes[MAX_NUM_NODES];
+
+/** */
+AcResult
+acGridInit(const AcMeshInfo node_config)
+{
+    acNodeCreate(0, node_config, &nodes[0]);
+    ++num_nodes;
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridQuit(void)
+{
+    acNodeDestroy(nodes[0]);
+    --num_nodes;
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridSynchronizeStream(const Stream stream)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridSwapBuffers(void)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridLoadConstant(const Stream stream, const AcRealParam param, const AcReal value)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridLoadVertexBufferWithOffset(const Stream stream, const AcMesh host_mesh,
+                                 const VertexBufferHandle vtxbuf_handle, const int3 src,
+                                 const int3 dst, const int num_vertices)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridLoadMeshWithOffset(const Stream stream, const AcMesh host_mesh, const int3 src,
+                         const int3 dst, const int num_vertices)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridLoadVertexBuffer(const Stream stream, const AcMesh host_mesh,
+                       const VertexBufferHandle vtxbuf_handle)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridLoadMesh(const Stream stream, const AcMesh host_mesh)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridStoreVertexBufferWithOffset(const Stream stream, const VertexBufferHandle vtxbuf_handle,
+                                  const int3 src, const int3 dst, const int num_vertices,
+                                  AcMesh* host_mesh)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridStoreMeshWithOffset(const Stream stream, const int3 src, const int3 dst,
+                          const int num_vertices, AcMesh* host_mesh)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridStoreVertexBuffer(const Stream stream, const VertexBufferHandle vtxbuf_handle,
+                        AcMesh* host_mesh)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridStoreMesh(const Stream stream, AcMesh* host_mesh)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridIntegrateSubstep(const Stream stream, const int step_number, const int3 start, const int3 end,
+                       const AcReal dt)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridIntegrateStep(const Stream stream, const AcReal dt)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+/** */
+AcResult
+acGridPeriodicBoundcondStep(const Stream stream)
+{
+    WARNING("Not implemented");
+    return AC_FAILURE;
+}
+
+#if 0
+/** */
+AcResult acGridReduceScal(const Stream stream, const ReductionType rtype,
+                          const VertexBufferHandle vtxbuf_handle, AcReal* result);
+/** */
+AcResult acGridReduceVec(const Stream stream, const ReductionType rtype,
+                         const VertexBufferHandle vec0, const VertexBufferHandle vec1,
+                         const VertexBufferHandle vec2, AcReal* result);
+#endif
+/** */
+AcResult
+acGridReduceScal(const Stream stream, const ReductionType rtype,
+                 const VertexBufferHandle vtxbuf_handle, AcReal* result)
+{
+    return 0;
+}
+/** */
+AcResult
+acGridReduceVec(const Stream stream, const ReductionType rtype, const VertexBufferHandle vec0,
+                const VertexBufferHandle vec1, const VertexBufferHandle vec2, AcReal* result)
+{
+    return 0;
+}
diff --git a/src/core/node.cu b/src/core/node.cu
index 2fbc008..8d4b48a 100644
--- a/src/core/node.cu
+++ b/src/core/node.cu
@@ -22,18 +22,6 @@
 #include "errchk.h"
 #include "math_utils.h" // sum for reductions
 
-#define AC_GEN_STR(X) #X
-const char* intparam_names[]   = {AC_FOR_BUILTIN_INT_PARAM_TYPES(AC_GEN_STR) //
-                                AC_FOR_USER_INT_PARAM_TYPES(AC_GEN_STR)};
-const char* int3param_names[]  = {AC_FOR_BUILTIN_INT3_PARAM_TYPES(AC_GEN_STR) //
-                                 AC_FOR_USER_INT3_PARAM_TYPES(AC_GEN_STR)};
-const char* realparam_names[]  = {AC_FOR_BUILTIN_REAL_PARAM_TYPES(AC_GEN_STR) //
-                                 AC_FOR_USER_REAL_PARAM_TYPES(AC_GEN_STR)};
-const char* real3param_names[] = {AC_FOR_BUILTIN_REAL3_PARAM_TYPES(AC_GEN_STR) //
-                                  AC_FOR_USER_REAL3_PARAM_TYPES(AC_GEN_STR)};
-const char* vtxbuf_names[]     = {AC_FOR_VTXBUF_HANDLES(AC_GEN_STR)};
-#undef AC_GEN_STR
-
 static const int MAX_NUM_DEVICES = 32;
 static Node node                 = NULL;
 
@@ -482,10 +470,7 @@ acNodeIntegrate(const Node node, const AcReal dt)
 static AcResult
 local_boundcondstep(const Node node, const StreamType stream, const VertexBufferHandle vtxbuf)
 {
-    if (num_devices == 1) {
-        acDeviceBoundcondStep(devices[0], stream, vtxbuf, (int3){0, 0, 0}, subgrid.m);
-    }
-    else {
+    if (num_devices > 1) {
         // Local boundary conditions
         for (int i = 0; i < num_devices; ++i) {
             const int3 d0 = (int3){0, 0, NGHOST}; // DECOMPOSITION OFFSET HERE
@@ -493,6 +478,9 @@ local_boundcondstep(const Node node, const StreamType stream, const VertexBuffer
             acDeviceBoundcondStep(devices[i], stream, vtxbuf, d0, d1);
         }
     }
+    else {
+        acDeviceBoundcondStep(devices[0], stream, vtxbuf, (int3){0, 0, 0}, subgrid.m);
+    }
     return AC_SUCCESS;
 }
 
@@ -532,9 +520,12 @@ acNodePeriodicBoundcondStep(const Node node, const Stream stream,
                             const VertexBufferHandle vtxbuf_handle)
 {
     local_boundcondstep(node, stream, vtxbuf_handle);
-    global_boundcondstep(node, stream, vtxbuf_handle);
     acNodeSynchronizeVertexBuffer(node, stream, vtxbuf_handle);
 
+    // TODO NOTE GLOBAL BOUNDCONDS NOT DONE HERE IF MORE THAN 1 NODE
+    global_boundcondstep(node, stream, vtxbuf_handle);
+    WARNING("Global boundconds should not be done here with multinode");
+
     return AC_SUCCESS;
 }