CEPT videotex standard as the CEPT3 profile. By embedding cursor-control characters within the page data, it was also possible to encode simple animations by re-writing parts of the screen already displayed. These were termed "dynamic frames" and could not be created online using conventional editing terminals, but required specialist software and uploading via the "bulk update" facility. No timing options were available beyond that imposed by the available transmission speed, usually 1,200 baud. The IP logo on line 1 occupied at least 43 bytes, depending on the number of control characters, so the space available for the IP's data is 877 characters at most. Lines could either occupy the full forty character positions, or be terminated early with a CR/LF sequence. Each control character took up two bytes, despite displaying as a single space, so the more complex a page, the less actual information could be presented. It was almost impossible, therefore, to display a right hand border to a page. Routing from page to page through the database was arranged by the use of numbered items on index pages, which used the space in the frame routing table to map the index links directly to other page numbers. Thus an index on page 747 might have links requiring the user to key 1 for "UK Flights", key 2 for "Flights to Europe", or key 3 for "Hotels" which represented links to page 74781, 74782, and 74791 respectively. The routing table for a particular frame only allowed specification of routes for digits 0–9, so double digit routes would typically be sent via an "intermediate" frame, usually a spare frame elsewhere in the IP's database, to which the first digit of all similarly numbered items would link. Since pressing a number would interrupt a page that was currently being displayed, the keying of a double digit route would not generally inconvenience the viewer with the display of the intermediate frame. Pages did not scroll, but could effectively be extended by the use of frames, which required alphanumeric suffixes to be appended to the numeric page numbers. Thus keying page *7471# actually resulted in the display of frame 7471a which could be extended by use of follow-on frames 7471b, 7471c etc. each of which was accessed by repeated use of the "#" key. Because the Prestel system was originally designed to be operated solely by means of a simple numeric keypad it