ON 20010722@7:26:17 PM at page:
http://piclist.org/techref/method/multitask.htm
DAV-MP-E62a David A Cary added 'Says

<p>
PIC specific
<a href="../microchip/multitasking.htm">
../microchip/multitasking.htm
</a>
'553 Null recipient not accepted