These system calls relate directly to heap objects:
| Create a heap object | CreateRtHeap |
| Delete a heap object | DeleteRtHeap |
| Allocate a memory buffer from a heap object and return a pointer to the caller | RequestRtBuffer |
| Return a previously-allocated buffer to its heap | ReleaseRtBuffer |
| Return a structure that contains information about a heap object | GetRtHeapInfo |
| Return the allocated size of a buffer previously allocated from a heap | GetRtBufferSize |