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I wrote a quick tutorial over at LabVIEW wiki about setting up subversion's svn diff to work with the new LVCompare.exe using the --diff-cmd switch. Hope it is helpful to others! http://labviewwiki.o...ng_capabilities

The exclusive access of serial resources in VISA from different applications is not a VISA "feature" but a Windows OS feature. Once an application has a serial port driver open, Windows will under normal conditions not allow another application to open that port again. As to why there is a Lock and Unlock. You can have applications that communicate from different locations through the same communication port. VISA supports that but obviously it can not know about the communication protocol so if location A writes a command and then location B writes another command (to possibly a different subdevice on that communication link) it is random who will read the response to the A command and who will read the response to the B command. Resource locking solves that problem reliably in that A locks the resource, writes the command and receives the response before unlocking. Rolf Kalbermatter