Final answer:
Two key points for requesting hotel accommodations by letter are to provide specific information about the desired accommodations and avoid solely mailing arrangements or requesting confirmation letters.
Step-by-step explanation:
The question pertains to writing a letter requesting hotel accommodations. When composing such a letter, it is important to provide specific information about the type of accommodations you desire. This includes details such as the dates of stay, number of guests, room preferences, and any special requests. On the other hand, two supporting details that are not recommended include arranging accommodations exclusively by mail, as this method is not as reliable or immediate as online or telephone bookings; and requesting a confirmation letter, which may be considered outdated or unnecessary, especially when electronic confirmations are commonly used.