System-internal memory management services are used internally, and should not be used by virtual devices. They are as follows:
| Service | Description |
|---|---|
| _GetDemandPageInfo | Retrieves information used for demand paging. |
| _MMGR_Toggle_HMA | Enables or disables the HMA. |
| _SetLastV86Page | Sets last page in V86 address space. |
| Set_Physical_HMA_Alias | Sets the physical HMA alias. |