[launchd-dev] Launch on demand from kernel extension?

[Colin]

Hello,

I have an OS X kernel extension that has settings that need to be  
saved and restored (the settings are not per-user).  Since a kernel  
extension cannot read/write a preference file, I have a helper daemon  
that interfaces with my kext and handles the reading/writing of the  
preference file.  I have recently converted over from using  
StartupItems to using launchd to launch my helper daemon at startup.

Is it possible, using launchd, to have my kernel extension launch the  
helper daemon on demand?  If so, what is the best way to implement  
this?  I need to support OS X 10.4.11 and above.

cheers,

colin