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h_free_mem()  Returns total heap free memory.
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 Syntax:

 int_ret = h_free_mem()

 Description:

 This function returns the total heap free memory.  h_free_mem() will
 return nonsense unless a h_walk(), h_rept(), or h_graph() is executed first.


----------------------------------[ Example ]------------------------------------

 h_walk()
 ? "Free memory  = " + str( h_free_mem() )
 ? "Used memory  = " + str( h_used_mem() )
 ? "Total memory = " + str( h_tot_mem()  )