Index_O

O

object linking and embedding (OLE), 98

objects, in Active Directory, 268

octet, 212

OEM (original equipment manufacturer), 239

offline data storage, 49

OLE (object linking and embedding), 98

one-way trusts, 256, 256-257

online data storage, 49

open source, 106

Open Systems Interconnection (OSI) model, 163

basics, 164-165

data transfer in, 166-167

IPX/SQX protocol in, 216

layer 1: physical, 168-169

layer 2: data-link, 170-171

layer 3: network, 172-173

layer 4: transport, 173-175

layer 5: session, 175-176

layer 6: presentation, 176-178

layer 7: application, 178-179

layer functions, 164-165

and TCP/IP protocol, 211

opening windows, in Windows XP Professional, 141

operating systems, 95

for client-server networks, 191

for domain network model, 193

DOS, 96-97. See also DOS

dual booting between, 106-107

Linux, 105-106, 229

OS/2, 102, 234

for peer-to-peer networks, 185

processor compatibility with, 3

Unix, 105, 224, 228-229

Windows, 98-104. See also Windows

Orb (Castlewood), 51

organizational units (OUs), 252-253, 268

original equipment manufacturer (OEM), 239

OS/2, 102, 234

OSI model. See Open Systems Interconnection (OSI) model

Outlook Express, 143

output. See input/output (I/O)