This game was played solely as a Play-by-Mail (PBM) game, where participants took turns by postal mail and, later, received their turn results. Some PBM games had no published components; others offered a published player's manual or introductory setting guide, etc. Salient details may be noted here in the description - especially for games with no published component.
From the introduction:
Gateway to Tékumel...is a play-by-mail role-playing game. As such, it is quite different from role playing games played in the privacy of your home. The limitations and freedoms of this type of game require some rules which would not be required if, for example, you came to my house to play (this is not an open invitation).