Wayne,
The following should work with the DZ_EASY.DLL interface:
#DEFINE cnUnzipQuiet 8
#DEFINE cnUnzipNoMsgs 40
*-- Suppress (most) messages
lnRetVal = SetUnzValue(lnUnzipId, cnUnzipQuiet, .t.)
*-- Suppress all messages except multi-volume prompts
lnRetVal = SetUnzValue(lnUnzipId, cnUnzipNoMsgs, .t.)
I hope this helps
Daniel