qb45qck.hlp (Table of Contents; Topic list)
DEF SEG Statement QuickSCREEN
  QuickSCREEN      Details      Example      Contents      Index
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DEF SEG - a memory statement that sets the current segment address
          for a subsequent PEEK function or BLOAD, BSAVE, CALL ABSOLUTE,
          or POKE statement
 
Syntax
  DEF SEG [=address]
    ■ If all arguments are omitted, the BASIC data segment is used.
    ■ address, a numeric expression has an unsigned integer value between
      0 and 65,535, is the beginning of the segment to be used by the
      other statement or function.