This is a simple blanker that clones the topmost screen
and then eats away at it bit by bit....

The rate of decay is configurable.

(Hey, I know it's pretty simple, but so are my C
 coding skills :)

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  253     396  63.9% -lh5- 5e2f Oct 25  1996 B_Decay.readme
[generic]                 3107    4464  69.6% -lh5- cb00 Oct 25  1996 B_Decay/clients/Decay
[generic]                 1272    3217  39.5% -lh5- 5429 Oct 25  1996 B_Decay/Decay.doc
[generic]                 1222    3021  40.5% -lh5- b2d8 Oct 25  1996 B_Decay/source/Decay.c
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files    5854   11098  52.7%            Oct 25  1996