IP address and software version

Is there a string I can call that send the IP address, mac address and software version to an lcd?

PLease post your code sofar - as it depends on your variables declared sofar

google sprintf() will probably help

Is there a string I can call that send the IP address, mac address and software version to an lcd?

IP and MAC address of what? The Arduino has neither. The ethernet shield does, but YOU defined them.

Software version of what? The only software on the Arduino that has a version number MIGHT be your sketch.

By the way, you don't call strings. You call functions.