# What's the difference between the Mac OS distributions?

The download page at http://www.sagemath.org/mirror/osx/intel/index.html links to two different distributions, with this description:

```
Pick (if available) your choice of Sage distribution:
*-app.dmg - to get Sage as a Mac OS X application that starts like most other Mac applications
*.dmg - to get the full Sage distribution for traditional Unix command-line like use
Both allow full use of the Sage Notebook and the command line.
```

The installation instructions at http://www.sagemath.org/mirror/osx/README.txt doesn't give different instructions for the different distributions, and I haven't found any other page that gives additional information.

- If both distributions allow full use and have the same installation instructions, what is the difference between them?
- If one of them can't be opened like a normal Mac Application, why do the instructions say to put it in the Applications folder?
- If one of them can be opened like a normal Mac Application, why do the instructions say to do more than just put it in the Applications folder?
- If the
`-app.dmg`

distribution is everything in the`.dmg`

distribution*plus*something that makes it run like a normal Mac Application, why is the`-app.dmg`

distribution*smaller*? - If installation consists of copying it into the Applications folder and setting the program to open it in, how do I invoke sage from a normal terminal session?
- If the UI is in a web browser, can I run Sage as a background service and just use it through a browser bookmark?

Hmm, there should be fairly detailed different instructions, and if you actually download the app bundle you will see a different readme. Strange it isn't there, though. These are all great questions - sorry I don't have time to answer now! I suspect someone else will, though.