$WW,1$A menu appears when you move the mouse to the top of the screen.  Menus are created with $LK,"MenuPush","MN:MenuPush"$(), $LK,"MenuFilePush","MN:MenuFilePush"$(), $LK,"MenuNew","MN:MenuNew"$() or $LK,"MenuFile","MN:MenuFile"$() and assigned to $FG,4$Fs->cur_menu$FG$.  The format is:

$FG,2$
File 
{
  Open(,'O');
  Save(,'S');
  Exit(,CH_SHIFT_ESC);
}
Edit {
  Cut(,,SC_DELETE|SCF_SHIFT);
  Paste(,,SC_INS|SCF_SHIFT);
}
Misc {
  Opt1(MSG_CMD,M_OPTION1);
  Opt2(MSG_CMD,M_OPTION2);
}
Help
{
  Help(,'?');
  About(,'/');
}
$FG$
The first arg is the msg code and it is optional with the default being $LK,"MSG_KEY_DOWN_UP","MN:MSG_KEY_DOWN_UP"$.  The second arg is the msg $FG,2$p1$FG$ value which is $FG,2$ASCII$FG$ of the key in the case of $LK,"MSG_KEY_DOWN","MN:MSG_KEY_DOWN"$.  The third arg is the msg $FG,2$p2$FG$ value which is the $FG,2$Scan Code$FG$ of the key in the case of $LK,"MSG_KEY_DOWN","MN:MSG_KEY_DOWN"$.

See $LK,"::/SparrowOS/Demo/PullDownMenu.CPP.Z","FI:::/SparrowOS/Demo/PullDownMenu.CPP.Z"$.