TrustedFilter SECUREcommand by 4Secure is a software component of their cross-domain solutions designed for bi-directional communication capabilities. It is specifically designed to enable inherently two-way, bi-directional TCP applications, such as HTTPS, to operate via two physically separate unidirectional flow control appliances. As part of the TrustedFilter software suite, it can be installed on a unidirectional appliance or flanking systems and is integrated with TrustedFilter Appliances to enable full bi-directional functionality in cross-domain environments. The solution incorporates a verification engine to ensure that only legitimate data is able to cross the network boundary.