Mutex and Vista Sessions

I am making an installer to patch a program.
Said program creates a mutant, which it checks to stop duplicated copies, which is good.

Problem is, it creates it in

\BaseNamedObjects\

Instead of:

\Sessions\1\BaseNamedObjects\

With the macro I have to create a mutex

!macro MutexCheck _mutexname _outvar _handle
System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${_mutexname}" ) i.r1 ?e'
StrCpy ${_handle} $1
Pop ${_outvar}
!macroend 

It creates the mutex in

\Sessions\1\BaseNamedObjects\

How can I 'attempt' to create it in

\BaseNamedObjects\

So I can check if the program is running (and block it from running while installer is! [most important bit])

Thank you for your time.

try naming the mutex "Global\Whatever"

Thank you very much!
I didn't expect it to be that easy.

I saw somewhere on Google something mentioning about sessions, and 'global' and some other keywords, but I guess it was late at night, and couldn't understand it at the time, hee hee.

Thank you again.