I2C Chip's PC-2-I2C usb/serial adaptor (http://www.i2cchip.com) just
has a simple serial ASCII interface that is like the Philips
documentation.
Most any language can use a serial/usb port.
If not you can use Realterm, which has an AciveX interface so that any
windows program can talk to the serial port.
(http://realterm.sourceforge.net)
eg to send the byte 0xF4 to a PCF8574 just send this string:
S 40 F4 P
If you didn't get it it means
[START] [Address 0x40, ie write to PCF8574] [data=0xF4] [STOP]
eg to read 1 byte from the same 8574
S 41 01 P
[START] [Address 0x41, ie read PCF8574] [Read 1 byte] [STOP]
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This adaptor is really intended for making cheap, fast, isolated
instrumentation. Since you are using labview, it might be up your
alley.
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BTW there are aslso programs to program eeproms from the commandline
floating about on the net.
regards
Simon
http://www.i2cchip.com