What do PPU files contain? symbolic links or hard links?

See below:

"
 - The .TPU format doesn't contain symbolic links to other units, it contains 
hard
links to particular offsets in the interface part of other .TPU files. If those 
other
units change their interface, the .TPU is made obsolete and needs to be 
recompiled.

 - Any reasonable update beyond a minor bug fix release is likely to change the
interface of some commonly used units like SYSTEM.  This makes everything 
obsolete.

 - Borland chose to do things this way because it leads to drastic speedups in
linking.  Essentially all the work involved in linking a unit to the units it 
uses
gets done during compile time, and doesn't need to be repeated again when the 
program
is linked.

"

Quoted from:

http://groups.google.com/group/comp.lang.pascal/browse_thread/thread/9cee95654ec4d045
/0d7281be97540061?q=%22windows+was+written+in+pascal%22&hl=en&

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