🚀 go-pugleaf

Sounds more like you need a singleton object rather than a program. 
Communication accross JAVA virtual machines requires special IPC methods
like sockets, RMI, CORBA etc.  For your particular situation you could
create a "ping" socket on your program.  Something that writes the word
"alive" to the socket when a connection is made.  You could then either
check this by hand (with a telnet client) or write another very simple
application to do it for you.  The java.net library is very powerful and
easy to use.  RMI and CORBA require a great deal more learning and over
head and would be like killing a fly with a shotgun for this particular
problem.  Hope this helps.


Will Williamson wrote:
> 
> Does anyone know how a program can check to see if another instance of
> itself is running before launching a new instance.  I need to make sure that
> only 1 instance of a program is loaded at any time on a particular
> omputer.  - Will Williamson.