Jeff.Mosmann wrote:
I have been trying to find documentation on two items, without success.

The first item concerns the use of the following form of explicit definition
to elicit immediate execution of a (possibly non-assigned) verb on loading a
script, as found in jijs.ijs:

3 : 0''

...

)

This may be passed only by oral tradition, the verb is anonymous, cf. this should be more obvious,
   (3 : 'y,y') 'abc'
abcabc


The second item concerns the foreign conjunctions 0!:100 and 0!:101, also
found in jijs.ijs.

in .... /j602/help/dictionary/dx000.htm
Scripts         0!:

0!:k y The script y is executed according to the digits (zero or one) in the 3-digit decimal representation of k :
        1st digit       2nd digit       3rd digit
  0     From file or noun       Stop on error   Silent
  1     From noun       Continue on error       Display
For example, 0!:111 abc executes the noun abc, completes, and displays.

eg,  100   1st digit is 1 ;  2nd digit is 0 ; 3rd digit is 0

regards,
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