FUNCTION RAT_ELBHD()

  Short:
  ------
  RAT_ELBHD() Determines if left mouse button is held down

  Returns:
  --------
  <lHeldDown> => is LMB held down

  Syntax:
  -------
  RAT_ELBHD([nSeconds])

  Description:
  ------------
  Determines if left mouse button is held down by
  calling the ASM function RAT_LBHD() for [nSeconds]. Default is .1
  seconds.

  If the left mouse button is held down during that
  time frame, True is returned, else False is returned.

  Note: the ASM function RAT_LBHD() returns a logical
  value if the left mouse button is depressed RIGHT NOW, but
  does not take a duration of [nSeconds] into account, which is needed
  to determine if it is depressed and HELD DOWN.

  [nSeconds]  is optional seconds to test for. Default
  is .1 seconds.

  Examples:
  ---------
   if rat_elbhd()

     ?"While you were out:"

     ?"Left button was depressed and held down at"

     ??rat_eqmrow(),rat_eqmcol()

   endif

  Source:
  -------
  S_MOOSE.PRG