receivePackets() // Receives all incoming packets
process() // Handles the packet queue
updateWorld() // World-stuff that needs to updated every tick
updateClients() // Sends the update queue to all of the clients

' All of these are easily accessible from the default properties on form and picture box controls
Store X, Y <-- Position of the picture box
Store picWidth, picHeight <-- Width and height of the picturebox
Store frmWidth, frmHeight <-- The width and height of your form

' Now, check if we're in bounds for each movement
If X > 0 Then
    ' Move left here
End If

If (X + picWidth) < frmWidth Then
    ' Move right here
End If

If Y > 0 Then
    ' Move up here
End If

If (Y + picHeight) < frmHeight Then
    ' Move down here
End If