small discovery RE 'visual effect' command

[Phil Davis]

I just discovered an undocumented feature: you can use the 'visual 
effect' command in conjunction with 'unlock screen' as well as with 
'go'. Like so:

   hide btn 1
   lock screen
   show btn 1
   visual effect dissolve very fast
   unlock screen -- btn 1 will dissolve into view

FWIW -
Phil Davis