Apple II
Technical Notes
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                                                  Developer Technical Support


HyperCard IIGS
#2:          Known HyperCard Bugs

Written by:  Dan Strnad & Matt Deatherage                          March 1991

This Technical Note documents known bugs in the released version of HyperCard
IIgs that may affect developers.
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HyperCard and Desk Accessories

HyperCard IIgs does not handle new desk accessories as well as it should. 
Specifically, the Edit menu is not handled properly:

o   When a desk accessory is first opened, HyperCard correctly enables all
    the Edit menu items except Undo.  If the desk accessory window then
    becomes not the frontmost window before being closed, HyperCard will not
    reenable the Edit menu items for the desk accessory.

o   HyperCard has an off-by-one error when calling SystemEdit to pass 
    Edit menu actions to desk accessories Cut is sent as Undo, Copy is sent
    as Cut,etc.  Undo is not enabled, so no error occurs when it is selected.
    It is impossible to send the Clear edit message to a desk accessory under
    HyperCard IIgs version 1.0 except through an external command or 
    procedure.


Externals limited to objects in the current stack

If you use any object or property of a different stack as a parameter to an 
XCMD or XFCN, HyperCard will crash.


Further Reference
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  o  HyperCard IIgs Script Language Guide
  o  HyperCard IIgs standard documentation (included with HyperCard IIgs)