In “$ZMAXTPTIme”, add precision and limits

In “$Storage”, Revise $STORAGE description

In “$ZTDAta”, add clarification

In “$ZICUver”, Added $ZICUVER Intrinsic Special Variable provides the current International Character Utilities (ICU)

In “$ZTIMeout”, microsecond accuracy

In “$ZCOmpile”, improve clarity and correctness

In “$ZCstatus”, mention ZLINK and auto-ZLINK

In “$ZTIMeout”, add TP behavior

In “$ZINTerrupt”, add more details about ISV handling in the interrupt state

In “$ZMALLoclim”, add $ZMALLOCLIM information

In “$Key”, add $KEY information for non-blocking WRITEs

In “$SYstem”, add that SET can modify the tail of the value

In “$ZCstatus”, correct typo in ISV name

In “$ZINTerrupt”, add more information on $ZINTERRUPT

In “$ZKey”, add information about the WRITE values

In “$ZTIMeout”, Add clarifications on behavior with different trap modes and vector contents.

In “$Horolog”, add reference to the system clock accuracy

In “$ZHorolog”, add reference to system clock accuracy

In “Interrupt Handling”, clean up and consolidate redundant text and insert an additional caution.

In “$ZGbldir”, specify that NEWing $ZGBLDIR is the same as SET $ZGBLDIR=""; remove redundant information and the caution note.

In “Interrupt Handling”, change Typing to READing; modifications in the service of clarity and reduce passive voice.

In “$ZAUDit”, add new section.

In “$ZCstatus”, update the description for V6.3-007

In “$Key”, changed "bad" to "malformed".

In “$ZPATNumeric”, UTF-8 mode tweaks.

In “$ZTIMeout”, add new section

In “$ZQuit”, add the description of $ZQUIT

In “$ZRELdate”, add ISV $ZRELDATE

In “$ZSTep”, Add section for $ZSTRPLLIM ISV.

In “$ZSTRPllim”, Add the new $ZSTRPLLIM ISV.

In “$ZROUTINES settings for auto-relink”, update for technical correctness and add more information about re-linked routines.

In “Establishing the Value from $gtmroutines”, revise the initial value from an undefined $gtmroutines

In “$ZROutines”, Fix $ZROUTINES references

In “Create a shared library from object (.o) files”, removed HP-UX, Soalris, Tru64 and z/OS references

In “$Reference”, added error case to the description.

In “Triggers ISVs”, added the description of $ZTDElim

In “$ZCHset”, removed the platform restriction wording and add the compilation warning.

In “$ZHorolog”, added missing $ to ISV name, deleted an extraneous space, and changed expect -> except.

In “$ZPATNumeric”, added a compile time warning.

In “$ZPOUT”, added zpin and zpout sections

In “$ZSTep”, added the role of $gtm_zstep

In “$ZUT”, $ZUT has a line about $ZH, which exists as a first line in $ZH; added links

In “$ZVersion”, added compile time warning.

In “$ZWRite()”, added information about the second argument and information about string inflation going to zwrite format. Modified description to use "argument" as a user found the use of expression unclear.

Updated “$ETrap”, “$ZTrap”, “$ETRAP Behavior”, and “Nesting $ETRAP and using $ESTACK” for V6.2-000 enhancements.

Updated “$Principal” for read and write behavior empty SOCKET and an empty non-$PRINCIPAL SOCKET device and added a note on creating a SOCKET device for $PRINCIPAL.

In “$Key”, added information about using $KEY with SOCKET devices.

Added two new sections called “$ZCLose” and “$ZKey”.

Corrected the description of “$ZVersion”.

In “$Key”, specified that GT.M maintains $KEY for terminals.