Need to execute a sub-VI continuously, while others are executed on demand.

I'm running into a problem while trying to develop a set of controls for a scanning probe microscope. I have a PID control which governs the height of the probe above the sample (feedback input is through a PCI DAQ card), and which needs to run at all times. I also have a scan control which raster-scans the area of interest as defined in the input. Both of these programs work fine on their own. the problem I am encountering is: due to the nature of the position control equipment, these controls must be consolidated into a single VI (the "device handle" can only be called in one program at a time). The PID needs to execute constantly and in real time, while the scan needs to execute only on command. is there a relatively simple way to call a sub-VI such that it will run continuously at a high priority, while allowing another to be called on demand? Specifically, I need to avoid either sub-VI becoming caught in a "while" or "case" structure and refusing to allow the other to execute.

I suppose I should have included a bit more information in my original post.
I am running under windows XP, the PID updates once per millisecond via analog voltage reading, the instrument can queue commands but there's no current need to do so as the speed with which I need to issue commands is significantly below the USB polling rate.
also, the problem with execution in parallel is that while the VI's are effectively independent, they both need to receive the same device ID from the controlling DLL. Unfortunately, the device ID command can't be called separately in each VI due to hardware restrictions, which is the reason I was looking for some sort of background execution option.
I'm attaching the VI's themselves to make the situation a bit more clear as well.
thanks for your input.
Attachments:
PID switchable1.vi ‏92 KB
Raster Scan1.vi ‏174 KB

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Need to execute a sub-VI continuously, while others are executed on demand.

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