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▀ This function call controls the size of the table that relates handle
  numbers for the current process to MS-DOS's internal, global table for
  all of the open files and devices in the system. The default table is
  located in the reserved area of the process's PSP and is large enough
  for 20 handles.
 
▀ The function fails if the requested number of handles is greater than 20
  and there is not sufficient free memory in the system to allocate a new
  block to hold the enlarged table.
 
▀ If the number of handles requested is larger than the available entries
  in the system's global table for file and device handles (controlled by
  the FILES entry in CONFIG.SYS), no error is returned. However, a subse-
  quent attempt to open a file or device, or create a new file, will fail
  if all of the entries in the system's global file table are in use, even
  if the requesting process has not used up all of its own handles.
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