C# Definition:

[Flags]
public enum PeekMessageParams : uint {
  PM_NOREMOVE = 0x0000,
  PM_REMOVE = 0x0001,
  PM_NOYIELD = 0x0002,
  PM_QS_INPUT = QueueStatusFlags.QS_INPUT << 16,
  PM_QS_POSTMESSAGE = (QueueStatusFlags.QS_POSTMESSAGE | QueueStatusFlags.QS_HOTKEY | QueueStatusFlags.QS_TIMER) << 16,
  PM_QS_PAINT = QueueStatusFlags.QS_PAINT << 16,
  PM_QS_SENDMESSAGE = QueueStatusFlags.QS_SENDMESSAGE << 16
}

VB Definition:

<Flags()> Public Enum PeekMessageParams
    PM_NOREMOVE = &H0
    PM_REMOVE = &H1
    PM_NOYIELD = &H2
    PM_QS_INPUT = QueueStatusFlags.QS_INPUT << 16
    PM_QS_POSTMESSAGE = (QueueStatusFlags.QS_POSTMESSAGE Or QueueStatusFlags.QS_HOTKEY Or QueueStatusFlags.QS_TIMER) << 16
    PM_QS_PAINT = QueueStatusFlags.QS_PAINT << 16
    PM_QS_SENDMESSAGE = QueueStatusFlags.QS_SENDMESSAGE << 16
End Enum

Notes:

Public Enum QueueStatusFlags
    QS_KEY = &H1
    QS_MOUSEMOVE = &H2
    QS_MOUSEBUTTON = &H4
    QS_MOUSE = (QS_MOUSEMOVE Or QS_MOUSEBUTTON)
    QS_INPUT = (QS_MOUSE Or QS_KEY)
    QS_POSTMESSAGE = &H8
    QS_TIMER = &H10
    QS_PAINT = &H20
    QS_SENDMESSAGE = &H40
    QS_HOTKEY = &H80
    QS_REFRESH = (QS_HOTKEY Or QS_KEY Or QS_MOUSEBUTTON Or QS_PAINT)
    QS_ALLEVENTS = (QS_INPUT Or QS_POSTMESSAGE Or QS_TIMER Or QS_PAINT Or QS_HOTKEY)
    QS_ALLINPUT = (QS_SENDMESSAGE Or QS_PAINT Or QS_TIMER Or QS_POSTMESSAGE Or QS_MOUSEBUTTON Or QS_MOUSEMOVE Or QS_HOTKEY Or QS_KEY)
    QS_ALLPOSTMESSAGE = &H100
    QS_RAWINPUT = &H400
End Enum