click see inside to get the block. Sorry, I couldn't think of many examples. here's an explanation by @TSTD about id/tag Id/tag is useful when it come to save data like on Scratch inside a single line of text. This system is kinda similar to Json and Minecraft NBT to store custom enemy/block/whatever with custom data/attribute from an id (here the line of text). The point is, you can use the ask block to get back this line of text, and make a save/import program!
This was inspired by @TSTD's id/tag project https://scratch.mit.edu/projects/356931109/ I know our code is similar, but it's not the same. I created this project without looking at his code. This code is much better because in @TSTD's version, 61{on_load:{say:hello}{set_block:5}} would return {say:hello but my version returns {say:hello}{set_block:5}. btw, I named the project id and tag not id/tag because if you search something like, example/other text, the part after the / disappears (because slashes are used in urls). I wanted it to be possible to search this, id and tag.