Where you want two columns to begin, insert the following lines:
.ll 3ithen highlight them with the mouse and select Format Note from the Region menu card. Then type the text you want to be in the left column. When you want to move to the right hand column, type the following lines:
.mk
.po 4.25iand highlight them and select Format Note as you did before. Any text that follows will be in the right hand column. When you wish to return to regular mode (default margins), type the following lines:
.rt
.poand select them as a Format Note.
.ll
One final note: do not use this for text that is intended to be more than one page long, as the hack does not account for that.