set visible of background button "Forward But" to true
set visible of background button "Backward But" to true
end openCard
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File Control Block (FCB), con't
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ΓÇó ioFCBFlNm -- The file number. I couldn't find this in the books. I suspect it is something left over from early system versions (and here for compatibility).
ΓÇó ioFCBFlags -- Flags that tell something about the state of the file.
ΓÇó RdWr -- Open for both read and write operations
ΓÇó Rd -- Open only for read operations
ΓÇó ResFork -- Resource fork is open
ΓÇó DataFork -- Data fork of file is open
ΓÇó Mod -- File has been modified in memory, must be written to disk
ΓÇó NoMod -- File is memory is copy of file on disk
ΓÇó ioFCBStBlk -- This is the disk block that holds the first byte of data in this file.