measure area of few rooms - command description

To measure area of more than one room:
1. Select first room
2. Decide whether to end measurement (E) or continue (C)
3. Finish action with End (E)
4. Specify room's block insertion point

Subsequently added areas will be filled with grey colour. Other attributes can be set with commands:

rmn - room numbe
rmr - room name
rmf - floor number/name

You can change settings of area's block with command rmp