LYON                                                               Menu: STTUS
==============================================================================
Activates all layers, or only a selected one.

         1.  (NUM) layer number to set on (1-255), <ENTER> for all

Description
This command activates a single specified layer or all the layers
of your model. The default is "all layers on," and remains
so until you turn off some or all layers.

To set a specific layer on, type the layer number. You may specify
more than one layer by typing a series of numbers with spaces between
them. You may continue to specify layers until selecting another command.

To set all layers on, press <ENTER>.

The entities in the specified layers will only be displayed following
the next redraw operation (e.g., \refr).

Example
\lyon 1 4
\refr

Result:Layers 1 and 4 are activated and displayed.
