Library /sys$common/syshlp/lse$menu.hlb DECW panes min rows text  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The minimum number rows in an automatically created window.

  LSE uses this setting and the Maximum Number of Windows setting to
  determine whether to add a window to the screen or reuse an existing
  window.  LSE checks both settings and creates a new window only if
  both conditions are met.