Spok Holdings delivers clinical information to care teams. Co. provides a suite of unified clinical communication and collaboration solutions that include call center operations, clinical alerting and notifications, one-way and advanced two-way wireless messaging services, mobile communications and public safety solutions. Co. provides one-way and two-way wireless messaging services. One-way messaging consists of numeric and alphanumeric messaging services. Two-way messaging services enable subscribers to send and receive messages to and from other wireless messaging devices, including pagers, personal digital assistants and personal computers.