how to differentiate strings ,

i have to send two string from one arduino to another arduino over serial communication. how can i differentiate them.

Time of sending.

The simplest way might be to add an identifier to each string and seperate the strings with a delimiter/end of string marker.

Nilanj:
i have to send two string from one arduino to another arduino over serial communication. how can i differentiate them.

send different content?

Chuck.