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This was a nontrivial problem, especially since there was no guarantee that the remote users could hear each other The ALOHA channel-access scheme that was developed to address this issue is elegant in its simplicity, and operates as follows: Remote devices simply transmit each frame as soon as it is generated, on the inbound channel The transmissions are completely asynchronous and independent of those that may (or may not) be transmitted by other remote devices If and only if a frame is received without error at the mainframe, an acknowledgment frame is sent to the remote device via the outbound channel If a remote device does not receive the acknowledgment frame within a time-out period, it waits a random length of time and then retransmits the entire frame Assuming that message generation follows Poisson statistics, it can be shown that the ALOHA system becomes unstable (ie.

The pop-up menus in CMDBAREXE are displayed by holding the Alt key and tapping the screen All of the pop-up menu code is therefore implemented in the WM_LBUTTONDOWN message handler in the main window procedure In the code below, bWhite and bBlack are BOOL global variables that indicate if the window is painted white or black, respectively case WM_LBUTTONDOWN: POINT pt; SHORT nState; int nSubMenuIndex; HMENU hPopupMenu, hSubMenu; ptx = LOWORD(lParam); pty = HIWORD(lParam); ClientToScreen(hwnd, &pt); nState = GetKeyState(VK_MENU); if (nState&0x80) { hPopupMenu = LoadMenu(ghInst, MAKEINTRESOURCE(IDR_POPUPS)); if (hPopupMenu) { nSubMenuIndex = (bBlack 0 : 1); hSubMenu = GetSubMenu(hPopupMenu, nSubMenuIndex); /* Insert the menu item for painting the window gray Also disable the revert to white menu item if the client area is already painted white */ if (bWhite) { InsertMenu(hSubMenu, 1, MF_BYPOSITION, IDC_SET_COLOR_GRAY, TEXT("Paint Window Gray")); EnableMenuItem(hSubMenu, IDC_CLEAR, MF_BYCOMMAND|MF_GRAYED); } TrackPopupMenu(hSubMenu, TPM_TOPALIGN|TPM_LEFTALIGN, ptx, pt.

y, 0, hwnd, NULL); } //End of if (hMenuPopup) block } //End of if (nState & 0x8000) block return (0); The WM_LBUTTONDOWN message is sent with the client coordinates of the point where the screen was tapped in the window that receives the message These coordinates are immediately converted to screen coordinates with a call to ClientToScreen This is because the TrackPopupMenu call that comes later expects its x and y parameters in screen coordinates The next interesting part of this piece of code tells us if the Alt key is being pressed The call to GetKeyState does this for us This function takes a virtual key code as its only parameter If the corresponding key is pressed, GetKeyState returns a SHORT whose high-order bit is 1.

, the number of retransmissions grows without bound) when the fraction of time the channel is utilized exceeds 1/(2e) % 0184 This relatively low value is the major drawback to ALOHA channel access, and modifying ALOHA to increase its channel utilization (and therefore channel capacity) has been of much research interest One of the rst approaches taken was to realize that a single transmitted frame could collide with two frames one starting before it and one starting after it had started and that the frame collision rate could be halved, and therefore the channel capacity doubled, by quantizing time into slots, then synchronizing the remote users so that frame transmission could only start at the beginning of each slot Frames would not be transmitted as soon as they were generated, as in ALOHA, but would be held in queue until the beginning of the next slot.

The algorithm estimates the joint probability p(X j , Y) that de nes either of these two measures, and that can be factorized as in (22). The Bayes rule and the following properties for joint events will be useful for obtaining expressions for p(X j , Y): For any two random variables X and Y , the joint probability of X and Y , P(X, Y ), can be expressed as a function of the conditional probability of X and Y , P(X/Y ), as P(X, Y ) = P(X/Y )P(Y ) (26)

If the Alt key is pressed, the code proceeds to load the pop-up menu resource and get a handle to the proper submenu, and the menu is displayed and tracked with TrackPopupMenu Two other interesting menu functions are demonstrated in the piece of code above In the case that the window was already painted white, a menu item for painting the window gray is added to the pop-up menu with a call to InsertMenu Otherwise the only choices will be for painting it black and reverting to white Also, if the window is white, the application disables the Revert To White option by calling EnableMenuItem The next two sections discuss how these features are implemented..

This became known as slotted ALOHA [38], and has a capacity of 1/e % 0368 (see Fig 86) Slotted or nonslotted, the ALOHA protocol is quite simple, and is often used as part of more complex medium-access methods (eg, PRMA, described in Section 8222) One advantage is in asymmetrically powered star networks, in which the controller is mains powered but the remote devices have limited power resources, and in which communication is initiated solely by the remote devices In these applications, using ALOHA, the initiating device(s) may stay asleep until a message is generated, then wake up, transmit the message, receive the acknowledgment, and return to sleep The responding device must keep its receiver constantly active, but the initiating device may have an extremely low duty cycle, since it need only.