Thanks to Raph and Ted for their help in my last question. Now I have
another one. I need different left and right margins on odd- and
even-numbered pages using the ms macros. This is dealt with PO and LL number
registers, but I somehow need to alter them according to whether a page is
odd- or even-numbered. I suppose I need to write a trap to do this. Are
there any implementations of this already available somewhere? I am
currently looking at macros used in production of the UTP book. Thanks.