By the way, I confirm that you can write ingame help for custom reactions. No more confusion!
The raws :
[REACTION:FLOAT_GREEN_WINDOW]
[NAME:Pour green glass windows(10)]
[DESCRIPTION:Cut a sheet of raw green glass into 10 windows.]
[DESCRIPTION: ]
[DESCRIPTION:Raw glass is made at a glass furnace.]
[DESCRIPTION: ]
[DESCRIPTION:Skill - Glassmaking]
[BUILDING:GLASS_FLOAT:CUSTOM_ALT_W]
[REAGENT:A:1:ROUGH:NONE:GLASS_GREEN:NO_SUBTYPE]
[PRODUCT:100:10:WINDOW:NONE:GLASS_GREEN:NONE]
[FUEL]
[SKILL:GLASSMAKER]
(This particular reaction will be updated to use sand in the future, now that it is possible.)
Is there any chance magic will be included in the next release? It was rather awesome in 6.2, especially being able to generate lava.
We need dfhack released first, then we'll see how long it will take to port the magic to 0.42.