C# Definition:

[Flags()]
public enum ProcessAccess : int
{
    /// <summary>Specifies all possible access flags for the process object.</summary>
    AllAccess = CreateThread | DuplicateHandle | QueryInformation | SetInformation | Terminate | VMOperation | VMRead | VMWrite | Synchronize,
    /// <summary>Enables usage of the process handle in the CreateRemoteThread function to create a thread in the process.</summary>
    CreateThread = 0x2,
    /// <summary>Enables usage of the process handle as either the source or target process in the DuplicateHandle function to duplicate a handle.</summary>
    DuplicateHandle = 0x40,
    /// <summary>Enables usage of the process handle in the GetExitCodeProcess and GetPriorityClass functions to read information from the process object.</summary>
    QueryInformation = 0x400,
    /// <summary>Enables usage of the process handle in the SetPriorityClass function to set the priority class of the process.</summary>
    SetInformation = 0x200,
    /// <summary>Enables usage of the process handle in the TerminateProcess function to terminate the process.</summary>
    Terminate = 0x1,
    /// <summary>Enables usage of the process handle in the VirtualProtectEx and WriteProcessMemory functions to modify the virtual memory of the process.</summary>
    VMOperation = 0x8,
    /// <summary>Enables usage of the process handle in the ReadProcessMemory function to' read from the virtual memory of the process.</summary>
    VMRead = 0x10,
    /// <summary>Enables usage of the process handle in the WriteProcessMemory function to write to the virtual memory of the process.</summary>
    VMWrite = 0x20,
    /// <summary>Enables usage of the process handle in any of the wait functions to wait for the process to terminate.</summary>
    Synchronize = 0x100000
}

VB.NET Definition:

<Flags()> _
Public Enum ProcessAccess As Integer
    ''' <summary>Specifies all possible access flags for the process object.</summary>
    AllAccess = CreateThread Or DuplicateHandle Or QueryInformation Or SetInformation Or Terminate Or VMOperation Or VMRead Or VMWrite Or Synchronize
    ''' <summary>Enables usage of the process handle in the CreateRemoteThread function to create a thread in the process.</summary>
    CreateThread = &H2
    ''' <summary>Enables usage of the process handle as either the source or target process in the DuplicateHandle function to duplicate a handle.</summary>
    DuplicateHandle = &H40
    ''' <summary>Enables usage of the process handle in the GetExitCodeProcess and GetPriorityClass functions to read information from the process object.</summary>
    QueryInformation = &H400
    ''' <summary>Enables usage of the process handle in the SetPriorityClass function to set the priority class of the process.</summary>
    SetInformation = &H200
    ''' <summary>Enables usage of the process handle in the TerminateProcess function to terminate the process.</summary>
    Terminate = &H1
    ''' <summary>Enables usage of the process handle in the VirtualProtectEx and WriteProcessMemory functions to modify the virtual memory of the process.</summary>
    VMOperation = &H8
    ''' <summary>Enables usage of the process handle in the ReadProcessMemory function to' read from the virtual memory of the process.</summary>
    VMRead = &H10
    ''' <summary>Enables usage of the process handle in the WriteProcessMemory function to write to the virtual memory of the process.</summary>
    VMWrite = &H20
    ''' <summary>Enables usage of the process handle in any of the wait functions to wait for the process to terminate.</summary>
    Synchronize = &H100000
End Enum

Notes:

Used with OpenProcess.

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