32-bit, not 32 bit or 32 bits. “32 bit result” should be “32-bit result”. However, “the result has 32 bits” has no hyphen.

4KB, 4MB, 2GB, 4TB -- not 4 kilobytes, not 4 Kilobytes, not 4 KB; the same is true for MB (not megabytes), GB (not gigabytes), TB (not terabytes).

Megahertz and gigahertz are MHz, GHz, not Mhz, Ghz.

B means bytes, b means bits; use appropriately. The usual place for lowercase b is in network rate indicators, such as 100Mb/s to mean 100 megabits per second.

administer, not administrate

a lot requires two words; alot is wrong

application-related, not application related. In titles, use Application-Related, not Application-related.

authenticate, not authentify

authentication, not authentification

authorize, not authorise

automatically, not automaticly

backup is a noun or adjective (as in a backup file), back up is a verb (as in to back up a database)

backward, not backwards

backward-compatible, not backward compatible or backwards compatible

behavior, not behavior

byte-swapping, not byte swapping

cannot, not can not

client-side, not client side

client/server, not client-server

color, not colour

command-line is an adjective, command line is a noun. Example: “You should use a command-line tool if you prefer entering commands on the command line.”

compliance, not compliancy

core dump is a noun or a verb (as in a core dump file or a program core dumps when it fails). In the latter case, however, it is better to say a program dumps core when it fails

CPU time, not CPU (in phrases like uses CPU time; unless you are referring the processor itself.)

CPU, not cpu

data file, data set, data type, not datafile, dataset, datatype

deprecate, not depreciate (depreciate is a word, but not the one you want when you are writing about features that we discourage people from using, and which may be removed in later releases)

deprecated, not depricated

different from something, not different than something

dynamically, not dynamicly

email, not e-mail

file-size, not file size

file name, file system, not filename, filesystem

floating-point, not floating point

following some, not something [shown] below

forward, not forwards

full-text, not fulltext (unless you are referring to a FULLTEXT index)

hand-held, not hand held

heavy-duty, not heavy duty

heavy-load production systems (used as an adjective), but used under heavy load (used on its own).

high-priority something (when used as an adjective), not high priority

host name, not hostname

indexes, not indices; exception: when referring to array elements, use “indices”

installation, not install (as a noun)

lettercase, not letter case

long-awaited, not long awaited

long-time something (when used as an adjective), not long time

lowercase, not lower case

low-volume something (when used as an adjective)

master/slave, not master-slave

memory-based, not memory based

multiple CPU, not multiple-CPU

multi-byte, not multi byte

multi-thread(ed), not multithread(ed)

multi-user, not multi user

natural-language, not natural language

Net (capitalized), if referring to the Internet in that way

NetWare, not Netware

Note:, not NOTE:

“Note that...” When a sentence begins this way, consider whether the "Note that" is useless noise that can be deleted or whether it is a necessary part of the sentence. If the reader really needs to be brought to a full stop, use a <note> element.

Object-oriented. It is hyphenated.

okay, not ok or Ok or OK. Exceptions: When describing instructions for a GUI with buttons that say OK, then use OK. That is, use the label that the GUI uses. When showing the output from a program, show the output exactly; do not change ok to okay, and so forth.

online, not on-line

onward, not onwards

Open Source, not open source

optimize, not optimise

otherwise is followed by a comma at the start of a sentence

percent, not per cent

platform-dependent, not platform dependent

PostScript, not Postscript

power-start, not power start

press Enter, or press the Enter key, not hit Return or hit Enter

publicly, not publically

re-issue(ing), not reissue(ing)

replication-safe, not replication safe

rewriting, not re-writing

rollback is a noun or adjective (as in a rollback operation), roll back is a verb (as in roll back a transaction)

runtime, not run time

schemas, not schemata

server-side, not server side

shown here, not shown below

single-CPU, not single CPU

statically, not staticly

“sub” is a prefix, not a word, so it's subfunction, rather than sub function, or subroutine, rather than sub routine (or sub-routine)

third-party, not third party

“this only”, not “only this”

thread-safe, not thread safe

toward, not towards

transaction-safe, not transaction safe

turnkey, not turn-key

uncorrelated subquery, not noncorrelated subquery

unstable, not instable

uppercase, not upper case

user-defined, not user defined

user name, not username

web page, web site, not webpage, website. Note: Pearson prefers Web page, Web site.

whether, not whether or not

wildcard, not wild card or wild-card