Asus P526 - Manual (Page 20)

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Operator access with a tool
If a TOOL is necessary to gain access to an OPERATOR ACCESS AREA, either
all other compartments within that area containing a hazard shall be inaccessible
to the OPERATOR by the use of the same TOOL, or such compartments shall be
marked to discourage OPERATOR access.
An acceptable marking for an electric shock hazard is (ISO 3864, No. 5036).
Equipment for restricted access locations
For equipment intended only for installation in a RESTRICTED ACCESS
LOCATION, the installation instructions shall contain a statement to this effect.