🚀 go-pugleaf

In article <1549@tuegate.tue.nl> rcbaem@eutrc3.urc.tue.nl (Ernst <pooh> 
Mulder) writes:

>  On the Lisa there's no difference between DAs and applications, and I

There were no DAs on the Lisa, because there was no need for them.  You 
could always launch another application, so it didn't make sense to create 
a separate DA mechanism.  The Calculator was just a simple application.

> couldn't even tell whether the Trash Can was in fact a separate

The Trash Can was implemented by the "Finder"; the underlying O/S was very 
conventional.

The folders and icons were stored in a database, and had nothing to do 
with the underlying file system.  In the file system documents had names 
such as {D1234T1}, but the user would see the "friendly" name.  Because of 
this, there was no restriction against giving two icons the same name.  
Also, most documents consisted of more than 1 physical file, but this was 
invisible to the user.

Another feature was that you could assign passwords to individual folders. 
 That was implemented in the File System.  Also, each application 
maintained the last saved version of the document as well as an optional 
set aside version.  The latter was created if you turned off the machine, 
and reopened when starting up again so that the user could pick up where 
s/he left off.

Larry Rosenstein, Apple Computer, Inc.
Object Specialist

Internet: lsr@Apple.com   UUCP: {nsc, sun}!apple!lsr
AppleLink: Rosenstein1