What are practical applications of Queues?

Running multiple applications likely crash?

• Quote Windows 9x/Me set aside two blocks of 64 KB memory regions for GDI and heap resources. By running multiple applications, applications with numerous GDI elements or by running applications over a long span of time, one could exhaust these memory areas. If free system resources dropped below 10%, Windows would become unstable and likely crash Quote what is he trying to say? Quote Users and software can render the operating system unable to function by deleting or overwriting important system files from the hard disk. Users and software are also free to change configuration files in such a way that the operating system is unable to boot or properly function. Quote Why would MS allow malware or software to delete or change those files? Quote Although Windows 9x features memory protection, it does not protect the first megabyte of memory from userland applications. This area of memory contains code critical to the functioning of the operating system, and by writing into this area of memory an application can crash or freeze the operating system. This was a source of instability as faulty applications could by accident write into this region and with that halt the operating system Quote sorry how does this work? Quote while Windows 95 and later operating systems offer the option of having profiles for multiple users, they have no concept of access privileges, making them roughly equivalent to a single-user, single-account operating system; this means that all processes can modify all files on the system that aren't open, in addition to being able to modify the boot sector and perform other low-level hard drive modifications. This enables viruses and other clandestinely installed software to integrate themselves with the operating system in a way that is difficult for ordinary users to detect or undo. The profile support in the Windows 9x family is meant for convenience only; unless some registry keys are modified, the system can be accessed by pressing "Cancel" at login, even if all profiles have a password. Windows 95's default login dialog box also allows new user profiles to be created without having to log in first. Quote So windows 95 or windows 98 did not have ALU? so anyone or malware can get in? Quote Windows 95 and Windows 98 also offer regressive support for DOS applications in the form of being able to boot into a native "DOS Mode" (MS-DOS can be booted without booting Windows, not putting the CPU in protected mode). This differs from the emulation used in Windows NT-based operating systems. Some very old applications or hardware require "DOS Mode". Having a command line mode outside of the GUI also offers the ability to fix certain system errors without entering the GUI. For example, if a virus is active in GUI mode it can often be safely removed in DOS mode, by deleting its files, which are usually locked while infected in Windows. Similarly, corrupted registry files, system files or boot files can be restored from the command line. Windows 95 and Windows 98 can be started from DOS Mode by typing 'WIN' <enter> at the command prompt. However, the Recovery Console for Windows 2000, which as a version of Windows NT played a similar role in removing viruses Quote I hear windows 98 had some problems with the shut down problems ,locking up and memory leaks but there is a patch for this.

• Answer:

  W95 & 98 run on dos which can only use the first 640k of memory directly and up to 1Mb with tweaks. Windows has to store everything it does in that first 640k so when you run lots of programs the dos memory is all used and although you may have loads of memory Windows cannot keep track of it in the restricted space available and either freezes, crashes or gives an error message. I would use Windows 2000 if I were you it is far more stable, can use loads of memory with no problem, is available cheaply and has drivers and libraries for devices that XP and later will not have. If you need native dos dual boot to windows 98 or ME and 2000, also windows 98 cannot reliably use more than 512Mb of memory without a lot of modifications.