set(my_panel1, SHOW);
set(my_panel2, SHOW);
set(my_panel3, SHOW);

set(my_panel1 | my_panel2 | my_panel3, SHOW);

A panel array 
PANEL* p_panels[20];

function set_panels(PANEL* p_pan[20], var p_flags) // I have no idea if flags can be stored in a var...
{
 var i=0;
for(i=0; i<20; i++)
{
 p_pan[i].flags |= p_flags;
}
}

exapm set_panels(p_panles, SHOW | TRANSLUCENT);

function reset_panels(PANEL* p_pan[20], var p_flags)
{
 var i=0;
for(i=0; i<20; i++)
{
 p_pan[i].flags &= p_flags;
}
}

exapm reset_panels(p_panles, ~SHOW | ~TRANSLUCENT);