herkforth source
Big Picture
herkforth source is made up of three things: 1) herkforth blocks (which contain herkforth source tokens) 2) herkforth dictionary 3) herkforth data
All three are persistent. When you save, all are saved. When you export to source, all are exported.
herkforth source tokens refer to herkforth dictionary entries. For herkforth data the dictionary entry for the data word refers to the data.
When you save, the above sections are spread out in memory so they have room to expand. herkforth data just uses the heap to expand.
Other Details
herkforth immediates (not immediates exactly)