''[[TODO: describe (only NRE-wiki page of relevance appears to be [http://tcl.msofer.com:8080/wiki?name=atProcExit+and+try/catch/finally]); rename the command to something more tclish?]]''
Consequence of [NRE]. 

[Lars H]: A thought: how is this different from what can be had through the age-old technique of creating a dummy local variable and putting an unset [trace] on it?
Basic implementation:
 proc atProcExit {script} {
    upvar 1 atProcExitScripts arr
    set arr($script) {}
    trace add variable arr($script) unset "$script\n\#"
 }

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