Intermec PENKEY 6100 Programmer's Reference Manual page 80

Supporting Windows Applications
Call PeekMessage()
" NOTE:
Some Windows application libraries are not written with mobile computing in mind and may
make use of PeekMessage() busy-loops in their message handlers.
Holding Off Suspend Time-outs
QUEST
USERSUSPEND
APM Event Broadcasts
Receiving APM Event Broadcasts
Windows Applications
R
3-12 PEN*KEY 6100 Computer Programmer's Reference Guide
if no messages, perform background processing
if there is no background processing to do, then
call GetMessage()
or
call WaitMessage()
SECTION 3
SUSPENDRE