any exec -                                  execute arbitrary object

bool proc if -                              execute proc if bool is true

bool proc1 proc2 ifelse -                   execute proc1 if bool is true
                                                and proc2 if bool is false

init incr limit proc for -                  execute proc with values from
                                            init by steps of incr to limit

int proc repeat -                           execute proc int times

proc loop -                                 execute proc an indefinite
                                            number of times

- exit -                                    exit innermost active loop

- stop -                                    terminate stopped context

any stopped bool                            establish context for catching
                                            stop
* pattern proc scratchstring filenameforall -    executes proc for each
                                                 file matching pattern
- countexecstack int                        count elements on exec stack

array execstack subarray                    copy exec stack into array

- quit -                                    terminate interpreter

- start -                                   executed at interpreter startup