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Even the linker can give a series of messages that warn the programmer  for
eventual problems or terminal errors (errors that halt the action  that was
taking place). The error message depends on the type of linker  used (.RTLINK,
BLinker, ExoSpace, etc.). Consult your linker manual  or the Norton Guides (if
available).

The most common errors regard externals (Unresolved externals). Externals  are
procedure calls that are not contained within the source. The  linker,
however, must create a "link" between the calling module and  the
external module that contains the procedure. If the linker has
scanned all the object module (.OBJ) and the library files (.LIB)
that make up the application and has not found a module
that contains  the procedure called, the following error message will be
shown: 'Unresolved  external'.