Declares following code as private to local module or class.
Private
The Public and Private directives are used to control the visibility of subsequent declarations in a module or class.
If the Private directive is used in the main body of a module, all subsequent declarations will be private and will not be visible outside of the current module.
PrivateGlobal x,y,z 'These are private to the current modulePublicGlobal P,Q,R 'These can be used by any module