Starting multiple instances of Matlab in Mac OS X Tiger

I am trying to start multiple instances of Matlab in Mac OS X 10.4, that is, there are several users in this machine, and they all need to use Matlab. Right now, only one user is able to do so, when a second user logs into his/her account and they start Matlab, it does not start. Actually, if one user has X11 open (not even Matlab) and another user tries to start Matlab it won't start. I'm not sure if this is a license problem, an X11 problem, or a Matlab problem. To start matlab, I am using the StartMATLAB.app located in the Applications folder. Following are the details for the hardware:
Model Name: Mac Pro
Model Identifier:
MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 8 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP21.007F.B06
SMC Version: 1.15f3
Serial Number: 157***UPZ
Some information about Mac OS:
System Version: Mac OS X 10.4.11 (8S2167)
Kernel Version: Darwin 8.11.1
The version of X11 is:
X11 1.1.3 - XFree86 4.4.0
I appreciate your help.
<Edited by Moderator>

See this article: An easy way to run multiple instances of any program.
I believe another alternative is to provide a separate copy of the application in the users own Home folder by placing it in the /Home/Applications/ folder. This may not work for all applications as some simply will not run multiple instances of itself.
Licensing is of course a separate issue as each unique user may require a license, although many licenses only restrict use to one CPU at a time rather than multiple users on a one CPU.

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