The Sticky Keys feature in X is an accessibility option that allows users to press modifier keys (such as Ctrl, Alt, Shift, or the Windows key) one at a time, instead of holding them down simultaneously, to perform keyboard shortcuts. For example, to copy something, a user can press Ctrl, release it, and then press C, instead of pressing Ctrl+C together. This can be helpful for users who have difficulty pressing multiple keys at once, or who prefer not to do so. References:
https://www.howtogeek.com/739764/how-to-turn-off-sticky-keys-on-windows-10/
https://geekflare.com/using-sticky-keys-in-windows/

TCP wrapper is a security tool that allows you to restrict the access to a network service based on the source IP address or hostname of the client. TCP wrapper works by intercepting the incoming connection requests to a service and checking them against a set of rules defined in the /etc/hosts.allow and /etc/hosts.deny files. If the client is allowed, the connection is passed to the service. If the client is denied, the connection is rejected and an error message is logged. References:
* LPI Linux Essentials: 1.5 Security and File Permissions: 1.5.3 Network Security
* LPIC-1: System Administrator: 102.5 Implement basic network security: 102.5.1 TCP Wrappers

The batch command is similar to the at command, except that it executes commands when the system load levels permit; in other words, when the load average drops below 1.5, or the value specified in the invocation of atd1. The at command allows us to schedule jobs using any of two commands: at and batch. While at runs commands at our specified time, batch runs commands when our system's load average is below 0.82. Both commands read commands from standard input or a specified file, and both commands send the output of the commands to the user by mail1. Therefore, the main difference between them is the time of execution: at runs at a fixed time, while batch runs when the system is idle. Reference: 1: Linux At, Batch, Atq, Atrm Command Help and Examples - Computer Hope 2: The "at" Command in Linux | Baeldung on Linux

In Bash, a function is a block of code that can be invoked by its name. A function can take arguments, which are passed to the function as positional parameters. The $1 variable refers to the first argument, $2 to the second argument, and so on. The function can access the number of arguments passed to it by using the $# variable. In this case, thefunction myfunction simply echoes the first and second arguments to the standard output. Therefore, when the command myfunction A B C is executed, the output is A B, since the third argument C is ignored by the function. References:
* [LPI Linux Essentials - Topic 103: Command Line Basics]
* [Bash Functions]