1. A computer-implemented method for concurrently accepting parameters in at least two contexts, the method comprising: receiving, in a mobile computing device, a character sequence comprising at least one character, each character having a first value associated with a first operating mode, and at least one of the characters having a second value associated with a second operating mode; responsive to receiving the character sequence, the mobile computing device automatically determining whether the character sequence produces a valid result in a first context associated with the first operating mode; responsive to determining the character sequence produces a valid result in the first context, performing a first action in the first operating mode using the first value for each character; responsive to determining the character sequence does not produce a valid result in the first context, the mobile computing device automatically determining whether at least one of the characters in the character sequence produces a valid result in a second context associated with the second operating mode; and responsive to determining the character sequence does not produce a valid result in the first context and at least one of the characters in the character sequence produces a valid result in the second context, performing a second action in the second operating mode using the second value for at least one of the characters.