It has to be syncable between clients on more or less any platform and most handhelds. It has to have different security levels for different users. There need to be group layers you can overlay on your own calendar views. It needs to be possible to select all the people you want to invite to something and have it block out when everyone's free by polling their calendars. It needs to be able to send e-mail invites and collect responses. You should be able to set multiple reminders for a given event.
needs to interact with an address book (like when you want to call someone)
needs to interact with web browser somehow.
and email program.
and also, would be nice to make the to-do items have a range of days for deadline of completion, with various ways to sort them (by importance, by first day they need to be complete, by the last day they need to be complete, make a list with about the same number of items to be completed each day, give them weights representing amount of time needed to complete, then make to -do list for each day trying to balance weights, etc.
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needs to interact with web browser somehow.
and email program.
and also, would be nice to make the to-do items have a range of days for deadline of completion, with various ways to sort them (by importance, by first day they need to be complete, by the last day they need to be complete, make a list with about the same number of items to be completed each day, give them weights representing amount of time needed to complete, then make to -do list for each day trying to balance weights, etc.