The menu in Sd, or the list of available calls in Sdtty, changes
according to the current setup.
For example, if the current setup is right-hand waves, the menu
will contain only those calls that the program believes
might be legal from right-hand waves. This determination is approximate
but conservative--appearance on the menu does not necessarily mean it
is legal, though absence from the menu means that the program is fairly
certain that it can't be legal. There is a universal menu that
appears when the setup is not one of the common ones, or when anything
complex is going on. This contains every call that is in the database
for the chosen level.
The call menu is alphabetized in a way that ignores blanks and hyphens.
Special keywords such as <N>, <ANYONE>, <DIRECTION>,
or <ANYTHING> are listed after letters.
Hence, <ANYONE> run and <ATC> your neighbor
will be found near the end of the menu.
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