How determine if a file is opened by another process

[Tom Rauschenbach]

Since fuser is not on every Un*x system, it's not gonna solve the problem
for everyone.  Does anyone know how to implement fuser in a more or less
portable way so that users of Topix, RTU, Dynix etc can do this too ?
-- 
Tom Rauschenbach           ((n < 0)?(-n):(0));
Vmark Software, Inc.
 ..uunet!merk!uvmark!tom