Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
MASM 5.1 Compatibility
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     Member names in unions and structures can begin with a period (.).
     This is the same as using OPTION DOTNAME.
 
     A declared structure can be accessed as a single unit. For
     example, a four-byte structure can be treated as if it were
     declared by a DWORD directive.
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