This is a functioning callback validation door.  It is not meant to be a
replacement for Al Saveriano's great AutoValidate door.  I just can't make
his work, and since Bill put this function in the library, I decided to see
just how easy it would be to write one in Arexx.  This archive contains
about 35 minute's worth of work, including testing.  Feel free to customize
it to your liking (thats why its in AREXX, so you can learn too!).

Larry