HI Neil,
That's the bitwise operator. There also an equivalence for and (b-and). See:-
documentation.microfocus.com/.../index.jsp
One trick you can use if that if you can set the property in a Form manually you can look at the MF generated code and copy it.
For example in this case just put a Label or Textbox on a form and in the control properties go to Font. Then change the Font and make it Bold with Underline.
This causes code to be generated in the code behind file form.designer.cbl that will do the font work at runtime when the form gets loaded. You can copy that code and use as a basis for what you want to do at runtime. You might want change and make it readable but it does give you a start point.
Regards
David