Dear SCO Customer,

Support Level Supplement (SLS) PTF3384, the SCO Streams Supplement, includes
a new I/O driver that addresses a problem with the streams mechanism for 
processing queued service routines.  The service routine is being called 
immediately after the putq() function call, rather than being scheduled to 
run after the put routine exists.

The replacement I/O driver included in PTF3384 changes this function so that
a put routine must exist before a service routine is called.

In order for the changes to take effect, a system reboot is required following
installation of this SLS. 


Software Notes and Recommendations
----------------------------------

SLS PTF3384 can be installed only on these releases:

         SCO UnixWare Application Server Release 2.1.0
         SCO UnixWare Personal Edition Release 2.1.0


Testing of the modified software contained in this SLS has been 
conducted only to the extent necessary to confirm that it resolves 
the problem stated above.  Such testing consists of recreating the 
problem conditions (typically in an SCO test laboratory) and verifying 
that the problem no longer occurs.  No other testing of this software 
has been done.


Hardware Notes and Recommendations
----------------------------------

This SLS is intended for i386, i486 and Pentium CPUs.


Installation Instructions
-------------------------

1. Download the ptf3384.Z and ptf3384.txt files to the /tmp directory
   on your machine.

2. As root, uncompress the file and add the SLS to your
   system using these commands:

       $ su
       # uncompress /tmp/ptf3384.Z
       # pkgadd -d /tmp/ptf3384

3. Reboot the system after installing this SLS.  A new unix kernel
   will be built and the system will then reboot itself.

A system reboot is required following installation of this SLS in order for
the changes to take effect.


Removal Instructions
--------------------

1. As root, remove the SLS:

       $su
       # pkgrm ptf3384

2. Reboot the system after removing this SLS.


If you have questions regarding this SLS, or the product on which it is
installed, please contact your software supplier.