The Windows security model enables you to control access to the service control manager (SCM) and service objects. The following provides detailed information regarding the Access Rights for the Service Control Manager.

C# Definition:

[Flags]
public enum SCM_ACCESS : uint
{
     STANDARD_RIGHTS_REQUIRED       = 0xF0000,
     SC_MANAGER_CONNECT         = 0x00001,
     SC_MANAGER_CREATE_SERVICE      = 0x00002,
     SC_MANAGER_ENUMERATE_SERVICE   = 0x00004,
     SC_MANAGER_LOCK        = 0x00008,
     SC_MANAGER_QUERY_LOCK_STATUS   = 0x00010,
     SC_MANAGER_MODIFY_BOOT_CONFIG  = 0x00020,
     SC_MANAGER_ALL_ACCESS      = STANDARD_RIGHTS_REQUIRED |
                      SC_MANAGER_CONNECT |
                      SC_MANAGER_CREATE_SERVICE |
                      SC_MANAGER_ENUMERATE_SERVICE |
                      SC_MANAGER_LOCK |
                      SC_MANAGER_QUERY_LOCK_STATUS |
                      SC_MANAGER_MODIFY_BOOT_CONFIG
}

VB Definition:

<Flags()> _
Public Enum SCM_ACCESS As UInteger
    STANDARD_RIGHTS_REQUIRED = &HF0000
    SC_MANAGER_CONNECT = &H1
    SC_MANAGER_CREATE_SERVICE = &H2
    SC_MANAGER_ENUMERATE_SERVICE = &H4
    SC_MANAGER_LOCK = &H8
    SC_MANAGER_QUERY_LOCK_STATUS = &H10
    SC_MANAGER_MODIFY_BOOT_CONFIG = &H20
    SC_MANAGER_ALL_ACCESS = STANDARD_RIGHTS_REQUIRED And SC_MANAGER_CONNECT And SC_MANAGER_CREATE_SERVICE And SC_MANAGER_ENUMERATE_SERVICE And SC_MANAGER_LOCK And SC_MANAGER_QUERY_LOCK_STATUS And SC_MANAGER_MODIFY_BOOT_CONFIG
End Enum

Notes:

see OpenSCManager