EX-99.1 2 a08-13158_1ex99d1.htm EX-99.1

Exhibit 99.1

 

CUSIP No. 411307 10 1

 

AGREEMENT

 

Pursuant to Rule 13d-1(k)(l) promulgated pursuant to the Securities Exchange Act of 1934, as amended, the undersigned agree that the attached Schedule 13G is being filed on behalf of each of the undersigned.

 

 

April 30, 2008

Sigma PartnerS V, L.P.

 

 

 

BY:

Sigma Management V, L.L.C.

 

ITS:

General Partner

 

 

 

 

 

 

 

By:

/s/ Robert E. Davoli

 

 

Robert E. Davoli

 

 

Managing Director

 

 

 

 

 

 

April 30, 2008

SIGMA ASSOCIATES V, L.P.

 

 

 

 

BY:

Sigma Management V, L.L.C.

 

ITS:

General Partner

 

 

 

 

 

 

 

By:

/s/ Robert E. Davoli

 

 

Robert E. Davoli

 

 

Managing Director

 

 

 

 

 

 

April 30, 2008

Sigma investors v, l.p.

 

 

 

 

BY:

Sigma Management V, L.L.C.

 

ITS:

General Partner

 

 

 

 

 

 

 

By:

/s/ Robert E. Davoli

 

 

Robert E. Davoli

 

 

Managing Director

 

 

 

 

 

 

April 30, 2008

SIGMA MANAGEMENT V, L.L.C.

 

 

 

 

 

 

 

By:

/s/ Robert E. Davoli

 

 

Robert E. Davoli

 

 

Managing Director