** Card

With this card a comment line can be defined whereby all text in this line is ignored.

On the Home tab, in the Edit group, click the  Comment icon.

The following lines of code contains a full comment line as well as comments at the end of lines that define variables.
** Definition of parameters
#lambda=1.0  ** Wavelength
#radius=#lambda/2  ** Cylinder radius
#height=2*#lambda  ** Cylinder height