There are the following nested execution services:
| Service | Description |
| Begin_Nest_Exec | Starts a nested execution block. |
| Begin_Nest_V86_Exec | Starts a V86 nested execution block. |
| End_Nest_Exec | Ends a nested execution block. |
| Exec_Int | Executes a software interrupt. |
| Exec_VxD_Int | Executes a software interrupt. |
| Restore_Client_State | Restores the client state. |
| Resume_Exec | Resumes execution of a virtual machine. |
| Save_Client_State | Saves the client state. |