Windows 3.1 Device Drivers (ddag31qh.hlp) (Table of Contents; Topic list)
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User Functions
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For network drivers that provide user functions, the following ordinals are
reserved for the user functions:
 
WNNC_ORD_UserStart      500
WNNC_ORD_UserEnd        599
 
File Manager never uses ordinals in this range.
 
 
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