Ksp reference Manual

2.8. on pgs_changed
on pgs_changed
Executed whenever any 
pgs_set_key_val()
command is executed in any script
Remarks
PGS stands for Program Global Storage and is a means of communication between script slots.
See the chapter on PGS for more details.
Examples
on init
pgs_create_key(FIRST_KEY, 1) {defines a key with 1 element}
pgs_create_key(NEXT_KEY, 128){defines a key with 128 elements}
declare ui_button $Push
end on
on ui_control($Push)
pgs_set_key_val(FIRST_KEY, 0,70 * $Push) 
Callbacks
8
KSP Reference Manual

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pgs_set_key_val(NEXT_KEY, 0, 50 * $Push) 
pgs_set_key_val(NEXT_KEY, 127, 60 * $Push) 
end on
Pressing the button...
on init
declare ui_knob $First (0,100,1)
declare ui_table %Next[128] (5,2,100)
end on
on pgs_changed
{checks if FIRST_KEY and NEXT_KEY have been declared}
if(pgs_key_exists(FIRST_KEY) and pgs_key_exists(NEXT_KEY))
$First := pgs_get_key_val(FIRST_KEY,0)
%Next[0] := pgs_get_key_val(NEXT_KEY,0)
%Next[127] := pgs_get_key_val(NEXT_KEY,127)
end if
end on
… will change the controls in this example, regardless of the script slot order