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LAYER_CURR()
   Returns the current layer or sets a new current layer.

   Syntax
         nCurrentLayer = LAYER_CURR([nLayer])

   Arguments
         OPTIONAL PARAMETERS
         nLayer              Sets the number of the new layer to select.

   Returns
         nCurrentLayer       Returns the current layer number.

   Description
         Returns the current layer and, optionally, changes to a new, open
         layer. If an invalid/closed layer is specified, the layer remains
         unchanged.

   Examples

         The following code would find the current layer:

         cur_layer = LAYER_CURR()                   && Get current layer #