SetDMsg ([cNew]) --> OldString:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Functions:
~~~~~~~~~~
serves as a switch, if set to true (if returns true), the dialog line
output is ensbled, if false it is disabled

Parameter description:
~~~~~~~~~~~~~~~~~~~~~~
lNew: new value to set the switch

Return value:
~~~~~~~~~~~~~
true/false

Example:
~~~~~~~~
    ? SetDMsg()        //the value of the switch
    SetDMsg(true)      //set the switch to true
    ? SetDMsg()        //returns true

Source code is in file  Object3.prg