:markdown
	## Available to Notebooks
	[$log](https://www.github.com/totemstan/enums)( ... )  
	[$trace](https://www.github.com/totemstan/enums)( "MESSAGE" )  
	[$pipe](https://www.github.com/totemstan/pipe)( BATCH => { if (BATCH) { do whatever } else { stream ended } )  
	[$ran](https://www.github.com/totemstan/randpr)( {KEY:VALUE, ... } )  
	[$task](https://www.github.com/totemstan/totem)( {KEY:VALUE, ... }, $ => {...}, msg => {...} )  
	[$jimp](https://www.npmjs.com/package/jimp)  
	[$copy](https://www.github.com/totemstan/enums)( SRC, TAR, "DEEP" )  
	[$each](https://www.github.com/totemstan/enums)( OBJ, (KEY, VAL) => {...} )  
	[$get](https://www.github.com/totemstan/man)( [...], "KEY=EVAL & ..." || (i,A) => { ... } )  
	[$get](https://www.github.com/totemstan/man)( "FILE ? _OPTION=VALUE & KEY=VALUE & KEY:=STORE$QUERY ..." , BATCH => { ... } )  
	[$fetch]()( "url" || "*SITE", txt => {...} )   
	[$sql](https://www.github.com/totemstan/jsdb)( sql => { ... } )  
	[$select](https://www.github.com/totemstan/totem)( "DATASET ? KEY=VALUE & ..." , recs => {...})  
	[$update](https://www.github.com/totemstan/totem)( "DATASET ? KEY=VALUE & ..." , {KEY:VALUE, ...}, info => {...})  
	[$insert](https://www.github.com/totemstan/totem)( "DATASET ? KEY=VALUE & ..." , {KEY:VALUE, ...}, info => {...})  
	[$delete](https://www.github.com/totemstan/totem)( "DATASET ? KEY=VALUE & ..." , info => {...})  

	## Notebook execution
	[$NOTEBOOK](https://www.github.com/totemstan/debe)( "USECASE ? STORE$.KEY" || "USECASE ? KEY" || "USECASE", {SETKEY:NEWVALUE, ... } )  
	[$NOTEBOOK](https://www.github.com/totemstan/debe)( "USECASE ? STORE$.KEY" || "USECASE ? KEY" || "USECASE" || {...}, CTX => { ... } )  
	[$NOTEBOOK](https://www.github.com/totemstan/debe)( "USECASE ? STORE$.KEY" || "USECASE ? KEY" || "USECASE" || {...} )  
	[$NOTEBOOK](https://www.github.com/totemstan/debe)( {keys:[...], cases:[...]} => { ... } )  

	## Notebook UIs
	[$NOTEBOOK.run](https://www.github.com/totemstan/debe)( {KEY:VALUE, ... } )  
	[$NOTEBOOK.brief](https://www.github.com/totemstan/debe)( {KEY:VALUE, ... } )  
	[$NOTEBOOK.plot](https://www.github.com/totemstan/debe)( DATA || "STORE", ... )  

	## Notebook access
	[$NOTEBOOK.focus](https://www.github.com/totemstan/debe)( "USECASE ? STORE$.KEY" || "USECASE ? KEY" || "USECASE" )  
	[$NOTEBOOK.edit](https://www.github.com/totemstan/debe)( )  
	[$NOTEBOOK.blog](https://www.github.com/totemstan/debe)( "PREFIX$KEY*POSTFIX", "UPDATE"  )  

	## Notebook revisors
	[$NOTEBOOK.insert](https://www.github.com/totemstan/debe)( {KEY: VALUE, ...} || "KEY=VALUE, ..." )  
	[$NOTEBOOK.delete](https://www.github.com/totemstan/debe)( {KEY: VALUE, ...} || "KEY=VALUE AND ..." )  
	[$NOTEBOOK.update](https://www.github.com/totemstan/debe)( {KEY: VALUE, ...} || "KEY=VALUE AND ..." )  

	where [notebook artifacts](https://github.com/totemstan/artifacts) provides currently published NOTEBOOKs.

	## Watch Dogs

	[$WATCH_dog](/api.view)()
	
	where { #{watchDogs} } are supported WATCH dogs.
	
	## Program control
	
	See [MATHJS](https://mathjs.org/) with following program control extensions. 
	
	If-then-else:
	
		if TEST
			DO
		elseif TEST
			DO
		:
		else
			DO
		end

	Switch-Case:
	
		switch TEST
			case TEST
				DO
			:
			default TEST
				DO
		end

	Looping:

		for INDEX
			DO
		end

		while TEST
			DO
		end

		until TEST
			DO
		end

	Events catch:

		try
			DO
		catch
			DO
		end

		when EVENT
			DO
		end

	Functions definition:
	
		def f=(x,y,...)
			DO
		end

	or in-lined using fat-arrows:

		(x,y,...) => {
			DO
		}