19.1 How can I read a single character from the keyboard without waiting for the RETURN key?
19.2 How can I find out how many characters are available for reading, or do a non-blocking read?
19.3 How can I display a percentage-done indication that updates itself in place, or show one of those ``twirling baton'' progress indicators?
19.4 How can I clear the screen, or print things in inverse video, or move the cursor?
19.5 How do I read the arrow keys? What about function keys?
19.6 How do I read the mouse?
19.7 How can I do serial (``comm'') port I/O?
19.8 How can I direct output to the printer?
19.9 How do I send escape sequences to control a terminal or other device?
19.10 How can I do graphics?
19.11 How can I check whether a file exists?
19.12 How can I find out the size of a file, prior to reading it in?
19.13 How can a file be shortened in-place without completely clearing or rewriting it?
19.14 How can I insert or delete a line in the middle of a file?
19.15 How can I recover the file name given an open file descriptor?
19.16 How can I delete a file?
What's wrong with the
19.18 How can I increase the allowable number of simultaneously open files?
19.20 How can I read a directory in a C program?
19.22 How can I find out how much memory is available?
19.23 How can I allocate arrays or structures bigger than 64K?
19.24 What does the error message ``DGROUP exceeds 64K'' mean?
19.25 How can I access memory located at a certain address?
19.27 How can I invoke another program from within a C program?
19.30 How can I invoke another program and trap its output?
19.31 How can my program discover the complete pathname to the executable from which it was invoked?
19.32 How can I automatically locate a program's configuration files in the same directory as the executable?
19.33 How can a process change an environment variable in its caller?
19.36 How can I read in an object file and jump to routines in it?
19.37 How can I implement a delay, or time a user's response, with sub-second resolution?
19.38 How can I trap or ignore keyboard interrupts like control-C?
19.39 How can I handle floating-point exceptions gracefully?
19.40 How do I... Use sockets? Do networking? Write client/server applications?
19.40b How do I use BIOS calls? How can I write ISR's? How can I create TSR's?
19.41 But I can't use all these nonstandard, system-dependent functions, because my program has to be ANSI compatible!