Press key F2, or select command Save from menu File.
Platform-dependent. I guess you are using TurboC, so it is SetTextColor and SetBackgroundColor from conio.h
I guess you wanted to ask: why don't DOS-programs (like TurboC and programs generated by TurboC) run on Windows 7? Answer: it is by design; unlike older versions, Windows 7 doesn't have a built-in DOS-emulator. Download and use DosBox.
Terminate and Stay Resident (TSR) programs are a DOS concept, not a Windows concept.
Search for BGIDEMO.C in your TurboC. There are thousands. Many Unix/Linux graphics programs are written mainly in C or C++, including X itself.
Turbo C
Function getenv.
The header file of graphics in TurboC is graphics.h
Try to execute INSTALL.EXE I will suggest to use Dev- C++ OR code Blocks IDE instead of turboC because it is old and not good with new windows versions. although if you want to install turbo c , just type in a good search engine "install turboc compiler",and you will find a number of results for download and install help.
A function in Borland's graphics library in TurboC; switches to graphics mode.
If this question is about TurboC for DOS, then no.
In C: nothing in TurboC: datafiles, necessary to graphics modes