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dBCreateMutex  (latest version 21-01-2007)

What :  This function will create a global mutex. This global mutex can be used in an Inno-Setup-Script, to avoid installation over a running instance of the programm. Inno is able to detect running instances even in a different Window-Session .

See the WikiPedia article of Bernd Hohenester 

http://de.wikibooks.org/wiki/Programmieren_mit_dBASE_PLUS:_Inno_Setup

Usage:

set procedure to mutex.prg additive

b_ok = dbcreatemutex("your_own_string")

if b_ok <>"OK"

msgbox(b_ok,"error",0)

endif

The ZIP-File contains the mutex.prg