You might want to limit the cursor movement area if you have drag-and-drop functionality within a form and you only want the user to drag an item inside a form. The ClipCursor function confines the cursor to a rectangular area on the screen. If a subsequent cursor position (set by the SetCursorPos function or the mouse) lies outside the rectangle, Windows automatically adjusts the position to keep the cursor inside the rectangular area. The form borders serve as the rectangular area for the ClipCursor function. To get the size of the form, use the GetClientRect function. This function retrieves the coordinates of a window's client area. The coordinates are relative to the upper-left corner of a window's client area; the coordinates of the upper-left corner are (0,0). This means you will have to convert the client coordinates to screen coordinates. The ClientToScreen function converts the client coordinates of a specified point to screen coordinates. The last function used is the OffsetRect function. The OffsetRect function moves the specified rectangle by the specified offsets. NOTE: If you unload the form after executing the ClipCursor function, the cursor will still be limited to the last coordinates of the now-unloaded form. To prevent this behavior, calling the ClipCursor function with a null argument in the Form_Unload event is recommended. Private Type RECT left As Integer top As Integer right As Integer bottom As Integer End Type Private Type POINT x As Long y As Long End Type Private Declare Sub ClipCursor Lib "user32" (lpRect As Any) Private Declare Sub GetClientRect Lib "user32" (ByVal hWnd As Long, lpRect As RECT) Private Declare Sub ClientToScreen Lib "user32" (ByVal hWnd As Long, lpPoint As POINT) Private Declare Sub OffsetRect Lib "user32" (lpRect As RECT, ByVal x As Long, ByVal y As Long) Private Sub Form_Load() Command1.Caption = "Limit Cursor Movement" Command2.Caption = "Release Limit" End Sub Private Sub Command1_Click() 'Limits the Cursor movement to within the form. Dim client As RECT Dim upperleft As POINT GetClientRect Me.hWnd, client upperleft.x = client.left upperleft.y = client.top ClientToScreen Me.hWnd, upperleft OffsetRect client, upperleft.x, upperleft.y ClipCursor client End Sub Private Sub Command2_Click() 'Releases the cursor limits ClipCursor ByVal 0& End Sub Private Sub Form_Unload(Cancel As Integer) 'Releases the cursor limits ClipCursor ByVal 0& End Sub