[NTG-context] Passing variable values on invoking context

A bit of help, please. I currently have a chunk at the start of a text file, like this \setvariables [Path] [Thread={Ee_01_PN}, ..... Mode=full] \stopbuffer I invoke the file with context filename.tex Is there a way to pass the value of the variable to context on invocation? So the top of the header might read: \setvariables [Path] [Thread={Ee_01_PN}, ..... ] \stopbuffer And the invocation: context filename.tex (bit of magic) Mode=full If so, I could use this a few times...it's not a big deal but would mean I could prepare some fixed command files, rather than a search and replace for Mode=full to Mode=light through al the text files called by this kind of invocation. Thanks in anticipation. Ian