PageMaker 4.2 does a Gestalt call for the AliasMgr and then proceeds
to use the Alias Manager, even if we say it's not present.  However,
it will avoid use of the Alias Manager if the Gestalt call itself
returns an error.  This doesn't appear to be within spec (IMVI), but
it looks like we should just not know the descriptors that we don't
support.  Boo.

MacInTax '93 does the same thing with the Edition Manager that
PageMaker does with the Alias Manager.  It's unclear how widespread
this problem is.

Claris Works does the same thing with Apple Events... bad!

Because of apps like this, there are a number of selectors that we
simply fail to recognize, because our support for the functionality
that is being queried is weak.  Here are the selectors that are likely
to fit in that category when 2.1 ships:

gestaltAliasMgrAttr
gestaltApplEventsAttr
gestaltAppleTalkVersion
gestaltAUXVersion
gestaltConnMgrAttr
gestaltCRMAttr
gestaltCTBVersion
gestaltDBAccessMgrAttr
gestaltEasyAccessAttr
gestaltEditionMgrAttr
gestaltFontMgrAttr
gestaltFXfrMgrAttr
gestaltHardwareAttr
gestaltHelpMgrAttr
gestaltMiscAttr
gestaltNotificatinMgrAttr
gestaltNuBusConnectors
gestaltOSAttr
gestaltPopupAttr
gestaltPowerMgrAttr
gestaltPPCToolboxAttr
gestaltResourceMgrAttr
gestaltScriptCount
gestaltScriptMgrVersion
gestaltSerialAttr
gestaltStdNBPAttr
gestaltTermMgrAttr
gestaltParityAttr
gestaltVMAttr
'icmp'
'sysa'

These selectors are recognized

gestaltDITLExtAttr
gestaltFindFolderAttr
gestaltFSAttr
gestaltSoundAttr
gestaltExtToolboxTable
gestaltToolboxTable
gestaltOSTable
gestaltFPUType
gestaltKeyboardType
gestaltLogicalPageSize
gestaltLogicalRAMSize
gestaltLowMemorySize
gestaltMMUType
gestaltPhysicalRAMSize
gestaltProcessorType
gestaltQuickdrawVersion
gestaltQuickdrawFeatures
gestaltTimeMgrVersion
gestaltVersion
gestaltMachineIcon
gestaltMachineType
gestaltROMSize
gestaltROMVersion
gestaltSystemVersion
gestaltTextEditVersion

These four will be ignored unless they are specifically enabled by the
"pretend" options (Pretend Help, Pretend Edition, Pretend Script,
Pretend Alias) in the preferences panel:

gestaltHelpMgrAttr
gestaltScriptMgrVersion
gestaltEditionMgrAttr
gestaltAliasMgrAttr

Thse two will be recognized if the system version is set to 7.0 or
higher via the prefs panel:

gestaltStandardFileAttr
gestaltApplEventsAttr

ARDI has added one special gestalt call, gestaltPHYSICAL ('MUL8')
which returns the address of a routine that functions just like
Gestalt, but provides access to a completely different set of tables.
These tables will contain information about the environment in which
Executor is running instead the emulated environment that Executor
provides.

Example:

int PhysicalGestalt (long selector, long *responsep)
{
  int retval;
  pascal int (*physfp) (long sel, long *responsep);

  retval = Gestalt ('MUL8', (void *) &physfp);
  if (retval == noErr)
    retval = physfp (selector, responsep);
  return retval;
}

...

  OSErr err;
  long vers;

  err = PhysicalGestalt ('sysv', &vers);
  /* err should be noErr and vers should be the version of Executor you're
     running, not the version of the System file we're emulating */

Right now there are only a few PhyscialGestalt selectors recognized:

gestaltSystemVersion,		numeric version of Executor
gestaltExecutorVersionString,	address of the string version of Executor
gestaltDemoStatus, 		1, if this is a demo version
gestaltDemoExpiration,		how many days until the demo expires
gestaltSerialNumber,		non-demo version: S/N
gestaltRegisteredName,		non-demo version: name 
gestaltRegisteredOrg,		non-demo version: organization
gestaltPhysicalRAMSize,		amount of physical ram on the machine
gestaltScreenSize,		resolution of the monitor
gestaltGhostScriptVersion,	win32 only: Ghostscript DLL version

gestaltGhostScriptVersion       = 'gost'
gestaltExecutorVersionString	= 'xqtr'
gestaltDemoStatus		= 'demo'
gestaltDemoExpiration		= 'xpir'
gestaltSerialNumber		= 's/n '
gestaltScreenSize               = 'scrn'
gestaltRegisteredName           = 'name'
gestaltRegisteredOrg            = 'org '

We are willing to add a variety of other PhysicalGestalt selectors as
Mac-developers require, including things like amount of memory on the
system and screen size.