How to Open Application just once !

I created a simple application but I dont want that my application be opened twice !
How to verify if my application is already running ???
If it is running is there any way to communicate with it ?
Tnx !

Hi,
There are several possibilities for this situation.
1 - first session gains a lock on a certain file (with a predefined or hard-coded name and location)
second session will be unable to gain a lock on the same file and will thus know that the
application is already up and running.
2 - first session opens a port (with a predefined or hard-coded number).
first session writes some opening message to this port.
first session starts a thread which will listen to this port each ... minutes/seconds.
second session opens port, writes some opening message to this port
first session receives the message through the port and will reply some notification
and request for closing session 2.
session 2 will close.
Several solutions are possible for running a limited number of occurences of the same application,
for running all applications within the same JVM, and more specific control over the startup-process.
Different kinds of information for controlling this setup-step can be transferred via (known) files and ports.
Also take a look at sockets and java RMI.
kind regards,
Koen

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