Windows NT

Tab Completion. This feature allows you to begin entering in a long filename from the command prompt, and to press the Tab key to have the rest of the long filename automatically completed.

Hive: HKEY_LOCAL_MACHINE
Key: Software\Microsoft\CommandProcessor
Name: PathCompletionChar
Data Type: REG_DWORD
Value: 9

The default value for this entry is 40, but it may also not be present at all.

Did you know the Win NT doesn't come with a defrag utility? And the system will do very strange things if you let it get too fragmented

http://www.sysinternals.com/ntw2k/freeware/pagedefrag.shtml defrags on boot
PerfectDisk 2000 - www.raxco.com - Schedulable, defragments pagefile directories and MFT and is the only commercial defragger capable of defragmenting ALL of the NTFS metadata ($LogFile, $Bitmap, etc...). PD2k runs on Win9x, WinMe, WinNT 4.0 and is certified for Win2k. From a central point you can schedule defrag activity throughout. No difference in functionality between the workstation and server version (both the workstation version AND server version can schedule through the network). PD2k is a "one pass" defragger - designed to do the job in one pass. PD2k also works very well with minimal usable freespace - as low as 5% where others may require alot more. PerfectDisk also does a excellent job of consolidating freespace - which means that the partition re-fragments slower. PerfectDisk uses the MS provided API's for defragging files. The user interface can be confusing.
Diskeeper - www.execsoft.com Recommended: Schedulable, defragments pagefile directories and MFT but is unable to defragment the rest of the NTFS metadata. DK runs on Win9x, WinNT 4.0 and is certified for Win2k. Requires their Server version if you want to schedule defrag activity through the network. May require multiple passes to completely defrag a partition. Diskeeper strongly suggests that you have at least 20% freespace in order to effectively defrag. Diskeeper uses the MS provided API's for defragging files.
O&O Defrag - www.oo-defrag.com. Recommended: Schedulable, defragments pagefile and MFT but doesn't defragment the rest of the NTFS metadata. You have to purchase their "Network Addition" which allows you to schedule through the network. O&O Defrag is a "one pass" defragger - designed to do the job in one pass. They have a separate Network Edition of their defragger that I believe does network scheduling but it slots into their own MMC type "framework". Works well in lower freespace conditions. O&O Defrag uses the MS provided API's for defragging files.
Speedisk 5.x - www.symantec.com. Schedulable, defragments pagefile, directories and MFT but is unable to defragment the rest of the NTFS metadata. SD runs on WinNT 4.0 and Win2k. Requires purchase of their Norton System Center if you want to schedule defrag activity through the network. SD is a "one pass" defragger - designed to do the job in one pass. Works very well in low freespace conditions. SpeedDisk also does a excellent job of consolidating freespace - which means that the partition re-fragments slower. SpeedDisk is the only defragger that does NOT use the MS provided API's for defragging files.
OnTrack's Suite - www.ontrack.com. A suite of products. You can't just buy the defragger. Schedulable. Works on NT 4 and Win2k. Don't know too much more about this one. Ontrack's defragger uses the MS provided API's for defragging files.
Defrag Commander and Defrag Commander NE - www.winternals.com. Remotely defrags NT and Win2K systems, also schedules the built-in defraggers on WinMe/9x and optionally Win2K. Works as an MMC snap-in. The NT/Win2K defrag engine is designed to do the job in "one pass" using the Microsoft defrag APIs but with no software installed on the systems being defragged. Defrag Commander also provides it's own defrag engine which does a far better job than using the Win2k built-in defragger. Provides no offline/ boot time defragging of pagefiles, directories or NTFS metadata.
Vopt - www.goldenbow.com. Works on NT4 and Win9x. Not sure if it works under Windows 2000. I don't know much about this defragger.

Did you know that NT (XP, etc...) systems (servers or workstations) will "fight" for the right to be the master browser (keep the list of who is on the network) unless you tell them not to? This is the cause of the "The master browser has recieved a server announcement from the computer..." error from Rdr with Event ID 8003. Contrary to some missinformation on web, the correct setting in \\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Browser\Parameters for the MaintainServerList is FALSE. it is NOT No, NO, False, etc... it has to be set to "FALSE" (without the quotes)