Library /sys$common/syshlp/edthelp.hlb RANGE, BUFFER  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 The BUFFER (abbreviated BU) specification may precede any other range
 specification and indicates that the range is to be applied to a named
 buffer.

 Format: BUFFER name [range]
     Or: =name [range]

 The two forms are equivalent.  Name is the name of the buffer in which
 the text resides.  If you leave out the range, the entire buffer is
 selected.