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Live syncing is a core feature offered by mSLDev. By default mSLDev will scan your computer automatically for any running instance of mIRC.
The Sync bar is broken down into each of the scripting sections of mIRC. Double clicking the script or alias files will open them in mSLDev for editing. By default mSLDev will sync the updated file with mIRC once the changes have been saved.
mSLDev simply looks at running instances - this means the location of installation is irrelevant - making it possible to run mSLDev AND mIRC as portably off a thumb drive with no issues (Provided all dependencies are accounted for).