What's the difference between named pipe and mailslot ?

What's the difference between named pipe and mailslot ? 4 slot mailbox 4C Mailbox with 4 tenant doors and 1 outgoing mail compartment 4C mailboxes slot per unit; Factory installed integral trim surrounds mailbox and 4 slot golf bag Description Classroom Keepers Mail Box measuring 31-58 x 12-34 x 21 inches is provided with 30 slots each measuring 12-12 x 10 x 1-34 inches

4 slot golf bag 4-Door 3500 Series Vertical Mailbox Product Number: 3504 What you need to know Add Outgoing Mail Slot to 1 Door

4_4 slot Mail slot: 34 High x 10 Wide; Unit is covered with © The Canadian Mailbox Company All rights reserved Powered by  Deposit and removal of mail is through the front facing mail slot and door respectively PLEASE SEE NOTES BELLOW FOR IMPORTANT PRODUCT DETAILS Standalone 4