Return the contents of a byte in memory.
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 Syntax

        GT_PeekB(<nSegment>,<nOffset>) --> nByte

 Arguments:

      <nSegment> is the segment of the byte in memory.

      <nOffset> is the offset of the byte in memory.

 Returns:

      The numeric content of the specified byte in memory.

 Description:

      GT_PeekB() can be used for getting numeric byte values from
      specific locations in memory.

 Examples:

      // Check if Caps Lock is active.

      nKeyboard := GT_PeekB(0,1047)
      ? "Caps Lock is "+if(GT_And(nKeyboard,64) == 0,"Off","On")

 Source: PEEKBYTE.C

 Author:  David Pearson