+ Some tracing features are enabled whenever the <STRONG>trace</STRONG> pa-
+ rameter is nonzero. Some features overlap. The specific
+ names are used as a guideline.
+
+ The other functions either return a pointer to a string-
+ area (allocated by the corresponding function), or return
+ no value (such as <STRONG>_tracedump</STRONG>, which implements the screen
+ dump for <STRONG>TRACE_UPDATE</STRONG>). The caller should not free these
+ strings, since the allocation is reused on successive
+ calls. To work around the problem of a single string-area
+ per function, some use a buffer-number parameter, telling
+ the library to allocate additional string-areas.
+
+ These functions check the <STRONG>NCURSES_TRACE</STRONG> environment vari-
+ able, to set the tracing feature as if <STRONG>trace</STRONG> was called:
+
+ filter, initscr, new_prescr, newterm, nofilter,
+ restartterm, ripoffline, setupterm, slk_init, tge-
+ tent, use_env, use_extended_names, use_tioctl