Designating 2 Arduinos as both Master and Slave

is possible write code such 2 arduinos communicating each other both make use of master , slave functionality?

setup: using 2 arduinos because have lot of equipment requires being monitored , operated , more 1 arduino multitasking simpler.

things want take advantage of:

wire.onrequest()
wire.onrecieve()

if can have these functions working on both devices, enables them send , receive data @ (depending on hear xyz sensor/button/device), extremely useful.

the place can see there being issues wire.begin() not yet understand how works.

thanks,

cypher

*edit, realize wire.begin() function may require address in case of slave, , in examples, wire.begin() listed in setup(), not use function outside of setup() when changing direction of these commands / requests?

*edit 2, i'm trying due possibly superfluous , can done in manner intended master/slave relationship?

wire.begin() initializes i2c in master mode.
wire.begin(0xa1) initializes i2c in master , slave mode.

if use parameter slave address, every possible combinations of master, slave, onreceive , onrequest possible.
the problem how prevent 2 arduinos want become master @ same time.

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